Added a section about contribution and fixed typos (#377)

Author: Nyholm

Diff for: CHANGELOG.md

@@ -62,7 +62,7 @@ All exceptions will be handled in the callback.
 - Added `ParameterBag` to store options.
 - Added `BatchClientInterface::sendAsyncRequest(RequestInterface $request, array $options = [])`.
 - Added `BuzzClientInterface::sendRequest(RequestInterface $request, array $options = []): ResponseInterface`.
-- Ported all Listeners to Middlewares.
+- Ported all Listeners to Middleware.
 - Added options to configure the client as constructor argument and when you send a request.
 
 ### Removed (BC breaks)
@@ -123,7 +123,7 @@ All exceptions will be handled in the callback.
 * Added Request and Response converters
 * Added `Curl::sendRequest()`, `MultiCurl::sendRequest()` and `FileGetContents::sendRequest()` that
   supports sending PSR-7 requests.
-* Added `Browser::sendRequest()` that supports middlewares.
+* Added `Browser::sendRequest()` that supports middleware.
 * Added `MiddlewareInterface` and `Browser::addMiddleware()`.
 * Added `HeaderConverter` to convert between PSR-7 styled headers and Buzz styled headers.
 

Diff for: README.md

@@ -132,6 +132,14 @@ compatibility.
 Being greatly inspired by [Symfony's bc promise](https://symfony.com/doc/current/contributing/code/bc.html), we have adopted
 their method of deprecating classes, interfaces and functions.
 
+## Contribute
+
+Buzz is great because it is small, simple and yet flexible. We are always happy to receive bug reports and bug fixes. We 
+are also looking forward to review a pull request with a new middleware, especially if the middleware covers a common
+use case. 
+
+We will probably not accept any configuration option or feature to any of the clients or the Browser. 
+
 ## Running the tests
 
 There are 2 kinds of tests for this library; unit tests and integration tests. They can be run separably by:

Diff for: doc/index.md renamed to doc/Readme.md

@@ -7,7 +7,7 @@ reading.
 * [Browser](#browser)
 * [Submit forms](#submit-a-form) 
 * [Client](/doc/client.md)
-* [Middlewares](/doc/middlewares.md) 
+* [Middleware](/doc/middleware.md) 
 * [Symfony Bundle](/doc/symfony.md) 
 
 

Diff for: doc/client.md

@@ -1,4 +1,4 @@
-[<-- Index](/doc/index.md)
+[<-- Index](/doc/Readme.md)
 
 # Clients
 
@@ -94,10 +94,10 @@ A proxy server to use when sending requests.
 #### push_function_callback
 
 Type: callable, null<br>
-Default: `null`
+Default: `null`<br>
 *Only for MultiCurl*
 
-A callable for `CURLMOPT_PUSHFUNCTION`. See [PHP docs](http://php.net/manual/en/function.curl-multi-setopt.php) 
+A callable for `CURLMOPT_PUSHFUNCTION`. See [PHP docs](http://php.net/manual/en/function.curl-multi-setopt.php).
 
 Since MultiCurl supports adding multiple requests, all Push Functions callbacks are
 chained together. If one of them returns `CURL_PUSH_DENY`, then the request will be denied. 
@@ -124,7 +124,7 @@ The time to wait before interrupt the request.
 #### use_pushed_response
 
 Type: boolean<br>
-Default: `true`
+Default: `true`<br>
 *Only for MultiCurl*
 
 If true, we can used responses pushed to us by HTTP/2.0 server push. 
@@ -138,4 +138,4 @@ If SSL protocols should verified.
 
 ---
 
-Continue reading about [Middlewares](/doc/middlewares.md).
+Continue reading about [Middleware](/doc/middleware.md).

Diff for: doc/middlewares.md renamed to doc/middleware.md

@@ -1,10 +1,10 @@
-[<-- Index](/doc/index.md)
+[<-- Index](/doc/Readme.md)
 
-# Buzz middlewares
+# Buzz middleware
 
 If you want to modify the request or response somehow, a middleware is the way to
 go. Every time you send a request with the `Browser` it will run through all the
-middlewares. The order of the middlewares is important. The first middleware added
+middleware. The order of the middleware is important. The first middleware added
 to the `Browser` will be the first one that is executed when handling the request and
 the last one to be executed when handling the response. 
 

Diff for: doc/symfony.md

@@ -1,4 +1,4 @@
-[<-- Index](/doc/index.md)
+[<-- Index](/doc/Readme.md)
 
 # Symfony integration
 
@@ -44,4 +44,4 @@ plugins method clients and whatever you want according to the
 
 ---
 
-Go back to [index](/doc/index.md).
+Go back to [index](/doc/Readme.md).

Diff for: lib/Browser.php

@@ -25,7 +25,7 @@ class Browser implements BuzzClientInterface
     /**
      * @var MiddlewareInterface[]
      */
-    private $middlewares = [];
+    private $middleware = [];
 
     /** @var RequestInterface */
     private $lastRequest;
@@ -143,7 +143,7 @@ public function submitForm(string $url, array $fields, string $method = 'POST',
      */
     public function sendRequest(RequestInterface $request, array $options = []): ResponseInterface
     {
-        $chain = $this->createMiddlewareChain($this->middlewares, function (RequestInterface $request, callable $responseChain) use ($options) {
+        $chain = $this->createMiddlewareChain($this->middleware, function (RequestInterface $request, callable $responseChain) use ($options) {
             $response = $this->client->sendRequest($request, $options);
             $responseChain($request, $response);
         }, function (RequestInterface $request, ResponseInterface $response) {
@@ -158,15 +158,15 @@ public function sendRequest(RequestInterface $request, array $options = []): Res
     }
 
     /**
-     * @param MiddlewareInterface[] $middlewares
+     * @param MiddlewareInterface[] $middleware
      */
-    private function createMiddlewareChain(array $middlewares, callable $requestChainLast, callable $responseChainLast): callable
+    private function createMiddlewareChain(array $middleware, callable $requestChainLast, callable $responseChainLast): callable
     {
         $responseChainNext = $responseChainLast;
 
         // Build response chain
         /** @var MiddlewareInterface $middleware */
-        foreach ($middlewares as $middleware) {
+        foreach ($middleware as $middleware) {
             $lastCallable = function (RequestInterface $request, ResponseInterface $response) use ($middleware, $responseChainNext) {
                 return $middleware->handleResponse($request, $response, $responseChainNext);
             };
@@ -179,12 +179,12 @@ private function createMiddlewareChain(array $middlewares, callable $requestChai
             $requestChainLast($request, $responseChainNext);
         };
 
-        $middlewares = array_reverse($middlewares);
+        $middleware = array_reverse($middleware);
 
         // Build request chain
         $requestChainNext = $requestChainLast;
         /** @var MiddlewareInterface $middleware */
-        foreach ($middlewares as $middleware) {
+        foreach ($middleware as $middleware) {
             $lastCallable = function (RequestInterface $request) use ($middleware, $requestChainNext) {
                 return $middleware->handleRequest($request, $requestChainNext);
             };
@@ -215,7 +215,7 @@ public function getClient(): BuzzClientInterface
      */
     public function addMiddleware(MiddlewareInterface $middleware): void
     {
-        $this->middlewares[] = $middleware;
+        $this->middleware[] = $middleware;
     }
 
     private function prepareMultipart(string $name, string $content, string $boundary, array $data = []): string