Add the changelog

CHANGELOG.md

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+1.2.0 / 2015-09-21
+==================
+
+This is the final release of this driver. The Selenium1 protocol is deprecated.
+The MinkSelenium2Driver should be used to interact with Selenium instead.
+
+BC break:
+
+* Changed the behavior of `getValue` for checkboxes according to the BC break in Mink 1.6
+
+New features:
+
+* Updated the driver to use findElementsXpaths for Mink 1.7 and forward compatibility with Mink 2
+* Implemented `submitForm`
+* Implemented `isSelected`
+* Return the condition in the `wait` method
+* Allow to specify alternative (not always '127.0.0.1') Selenium server url
+* Implemented `getScreenshot`
+* Implemented `evaluateScript`
+* Implemented `maximizeWindow`
+* Implemented `getOuterHtml`
+* Added support of non-textual fields in `setValue`
+* Changed the finding of elements to use Selenium rather than the source
+
+Bug fixes:
+
+* Fixed the retrieval of HTML attributes in `getAttribute`
+* Fixed the support of textareas in `getValue`
+* Fixed the removal of cookies
+* Fixed the escaping of multiline XPath queries
+* Fixed the execution of self-executing functions not wrapped in braces
+* Added error handling when using the crawler to avoid fatal errors
+* Fixed the execution of long JavaScript code
+* Fixed the retrieval of values for radio groups
+* Fixed the selection of option in a radio group
+* Fixed the custom triggering of change events
+
+Testsuite:
+
+* Updated the testsuite to use the new Mink 1.6 driver testsuite
+* Added testing on HHVM
+
+Misc:
+
+* Updated the repository structure to PSR-4