Add changelog for 1.4.0

CHANGELOG-1.4.md

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+CHANGELOG for 1.4.x
+===================
+
+This changelog references the relevant changes (bug and security fixes) done
+in 1.4.x patch versions.
+
+1.4.0 (2016-11-22)
+------------------
+
+ * [#244](https://github.com/doctrine/mongodb/pull/244): Use short array syntax
+ * [#263](https://github.com/doctrine/mongodb/pull/263): Fix wrong parameter in count method
+ * [#264](https://github.com/doctrine/mongodb/pull/264): Drop support for PHP 5.5
+ * [#273](https://github.com/doctrine/mongodb/pull/273): Remove unused use statements
+ * [#274](https://github.com/doctrine/mongodb/pull/274): Loggable GridFS collection
+ * [#275](https://github.com/doctrine/mongodb/pull/275): Deprecate update() and multiple() methods in query builder
+ * [#246](https://github.com/doctrine/mongodb/pull/246): Open up aggregation builder API for use in ODM
+ * [#278](https://github.com/doctrine/mongodb/pull/278): Run travis tests against MongoDB 3.2 and 2.6
+ * [#276](https://github.com/doctrine/mongodb/pull/276): Support passing driver options to connection class
+ * [#277](https://github.com/doctrine/mongodb/pull/277): Pass query options when running count command
+ * [#280](https://github.com/doctrine/mongodb/pull/280): Use argument unpacking insteda of call_user_func
+ * [#279](https://github.com/doctrine/mongodb/pull/279): Allow passing multiple arguments to add* methods

UPGRADE-1.4.md

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+Upgrade from 1.3 to 1.4
+=======================
+
+PHP version support
+-------------------
+
+ * Support for PHP 5.5 has been dropped as it has reached its end of life.
+ * PHP 7 and PHP 7.1 are supported using [mongo-php-adapter](https://github.com/alcaeus/mongo-php-adapter).
+
+Query builder
+-------------
+
+ * The `update()` and `multiple()` methods have been deprecated. Use `updateOne`
+   or `updateMany` instead.
+ * The `addAnd()`, `addNor()` and `addOr()` methods now accept multiple parameters.
+   Before:
+   ```php
+   $builder
+       ->addAnd($someExpression)
+       ->addAnd($otherExpression);
+   ```
+
+   After:
+   ```php
+   $builder->addAnd($someExpression, $otherExpression);
+   ```
+
+Aggregation builder
+-------------------
+
+ * The `addAnd()` and `addOr()` methods now accept multiple parameters.
+
+Connection
+----------
+
+ * Passing driver options to the connection class is now supported. You can pass
+   a stream context as shown in the PHP documentation:
+   ```php
+   $context = stream_context_create([
+       'mongodb' => [
+           'log_cmd_insert' => function () {
+               // Logic goes here...
+           }
+       ],
+       'ssl' => [
+           'allow_self_signed' => false,
+       ]
+   ]);
+   $connection = new \Doctrine\MongoDB\Connection(null, [], null, null, ['context' => $context]);