update docs

Author: mjaschen

Diff for: docs/010_Installation.md

@@ -2,7 +2,7 @@
 
 ## Requirements
 
-Minimum required PHP version is 8.1. *phpgeo* is tested up to PHP 8.3.
+Minimum required PHP version is 8.2. *phpgeo* is tested up to PHP 8.4.
 
 New features will only go into the main branch and won't be backported.
 
@@ -12,10 +12,11 @@ Please refer to the following table for the compatibility matrix:
 ### Compatibility Matrix
 
 | PHP Version | phpgeo Version |   Support Status   | Composer Install                        |
-| :---------: | :------------: | :----------------: | --------------------------------------- |
-|     8.3     |      5.x       |     ✅ active      | `composer require mjaschen/phpgeo`      |
-|     8.2     |      5.x       |     ✅ active      | `composer require mjaschen/phpgeo`      |
-|     8.1     |      5.x       |     ✅ active      | `composer require mjaschen/phpgeo`      |
+|:-----------:|:--------------:| :----------------: | --------------------------------------- |
+|     8.4     |      6.x       |     ✅ active      | `composer require mjaschen/phpgeo`      |
+|     8.3     |      6.x       |     ✅ active      | `composer require mjaschen/phpgeo`      |
+|     8.2     |      6.x       |     ✅ active      | `composer require mjaschen/phpgeo`      |
+|     8.1     |      5.x       | ⚠️ security only      | `composer require mjaschen/phpgeo`      |
 |     8.0     |      4.x       | ⚠️ security only | `composer require mjaschen/phpgeo:^4.0` |
 |     7.4     |      4.x       | ⚠️ security only | `composer require mjaschen/phpgeo:^4.0` |
 |     7.3     |      4.x       | ⚠️ security only | `composer require mjaschen/phpgeo:^4.0` |

Diff for: docs/015_Upgrading.md

@@ -1,6 +1,24 @@
 # Upgrading phpgeo
 
-## Update from phpgeo 4.x to phpgeo 5.x
+### Upgrade from phpgeo 5.x to phpgeo 6.x
+
+### Requirements
+
+- *phpgeo* 6.x requires at least PHP 8.2.
+
+### Update phpgeo
+
+- run `composer require mjaschen/phpgeo:^6.0` or
+- update the version constraint in your `composer.json` to `^6.0` and run `composer update`
+
+### Update Your Code
+
+*phpgeo* has some breaking changes in the 6.x release line. Please refer to the following list to see what has changed
+and what you need to do to upgrade your code.
+
+- Ensure your class has a `getBounds()` method if you implement `GeometryInterface` in your own classes.
+
+## Upgrade from phpgeo 4.x to phpgeo 5.x
 
 ### Requirements
 
@@ -17,7 +35,7 @@
 
 There are some new deprecations introduced in 5.0, please see the [change log](https://github.com/mjaschen/phpgeo/blob/main/CHANGELOG.md) for a detailed list and update your code accordingly to be prepared for 6.0.
 
-## Update from phpgeo 3.x to phpgeo 4.x
+## Upgrade from phpgeo 3.x to phpgeo 4.x
 
 ### Requirements
 
@@ -35,7 +53,7 @@ There are some new deprecations introduced in 5.0, please see the [change log](h
 
 No breaking changes were introduced with *phpgeo* 3.0.
 
-## Update from phpgeo 2.x to phpgeo 3.x
+## Upgrade from phpgeo 2.x to phpgeo 3.x
 
 ### Requirements
 

Diff for: docs/020_Development.md

@@ -32,10 +32,10 @@ command to ensure the sources don't contain any syntax error:
 composer ci:lint
 ```
 
-A static code analysis with [Psalm](https://psalm.dev/) is configured as well:
+A static code analysis with [PHPStan](https://phpstan.org/) is configured as well:
 
 ``` shell
-composer ci:psalm
+composer ci:phpstan
 ```
 
 It's possible to run all tests at once:
@@ -47,7 +47,7 @@ composer ci
 … or run all CI tasks with different PHP versions one after another:
 
 ```shell
-for PHP_VERSION in 8.1 8.2 8.3 ; do \
+for PHP_VERSION in 8.2 8.3 8.4 ; do \
   docker run -it --rm -v "$PWD":/phpgeo -w /phpgeo \
   ghcr.io/mjaschen/php:${PHP_VERSION}-cli-mj composer ci || break ; \
 done