Prepare 2.0 release

Author: tobias-93

CHANGELOG.md

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+# Changelog
+
+## v2.0.0 - 2017-11-08
+- Add Symfony 3.* compatibility
+- Added `--pretty-print` option to `fos:js-routing:dump`-command, making the resulting javascript pretty-printed
+- Removed SF 2.1 backwards compatibility code
+- Add automatic injection of `locale` parameter
+- Added functionality to change the used router service
+- Added normalizer classes