Add the changelog

CHANGELOG.md

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+1.2.0 / 2015-09-21
+==================
+
+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 'localhost') Sahi server url
+* Implemented `getOuterHtml`
+
+Bug fixes:
+
+* Fixed `getValue` for multi-select without `name` attribute
+* Fixed the returned value for missing cookies
+* Fixed the removal of cookies
+* Fixed double xpath escaping in `selectRadioOption`
+* Fixed the escaping of multiline XPath queries
+* Fixed double JS escaping of XPath strings when executing scripts
+* Fixed the evaluation of scripts
+* Fixed `executeScript` for scripts with trailing `;` or `return`
+* Improved the escaping of variables used in JS code
+
+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