updating changelog for v2.1.1 release

Changelog.md

@@ -0,0 +1,30 @@
+# ChangeLog
+
+## [Unreleased]
+
+- "It was a bright day in April, and the clocks were striking thirteen." - 1984
+
+## [2.1.1] - 2015-01-25
+
+- added v2.1.1 to the PhantomJS versions array to
+- Automatic download retrying with version lowering, if download fails with 404
+- class `PhantomInstaller\PhantomBinary` is created automatically during installation,
+  to access the binary and its folder more easily
+- added support Composer patch version tag with a patch level, like "2.1.1-p02"
+- added usage examples (inside `/test`), each with a different `composer.json` file
+- add support for vendor-dir as installation folder for the extracted "phantomjs"
+
+## [2.0.0] - 2014-08-09
+
+## [1.9.8] - 2014-07-10
+
+## [1.9.7] - 2014-06-24
+
+- Initial Release
+- grab version number from explicit commit references, issue #8
+
+[Unreleased]: https://github.com/jakoch/phantomjs-installer/compare/2.1.1...HEAD
+[2.1.1]: https://github.com/jakoch/phantomjs-installer/compare/2.0.0...2.1.1
+[2.0.0]: https://github.com/jakoch/phantomjs-installer/compare/1.9.8...2.0.0
+[1.9.8]: https://github.com/jakoch/phantomjs-installer/compare/1.9.7...1.9.8
+[1.9.7]: https://github.com/jakoch/phantomjs-installer/releases/tag/1.9.7

README.md

@@ -94,7 +94,7 @@ Usage:
 
 This feature is similar to `location.js` of the [phantomjs module](https://github.com/Medium/phantomjs/blob/master/install.js#L93) for Node.
 
-## Automatic version lowering on 404
+## Automatic download retrying with version lowering on 404
 
 In case downloading an archive fails with HttpStatusCode 404 (resource not found),
 the downloader will automatically lower the version to the next available version