Add changelog

CHANGELOG.md

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+# Changelog
+
+## [Unreleased]
+
+### Added
+
+- New method `isLoopback()` [#37](https://github.com/rlanvin/php-ip/pull/37)
+- New method `isLinkLocal()` [#43](https://github.com/rlanvin/php-ip/pull/43)
+- New method `reversePointer()` [#44](https://github.com/rlanvin/php-ip/pull/44)
+- New method `IpBlock::getGivenIp` to return the IP used in the constructor [#6](https://github.com/rlanvin/php-ip/pull/6)
+
+### Removed 
+
+- Drop support for PHP 5 [#8](https://github.com/rlanvin/php-ip/issues/8)
+
+## [1.0.1] - 2015-06-26
+
+### Fixed
+
+- Compatibiliy issues with PHP 5.4, 5.5 and 5.6
+
+## 1.0.0 - 2015-04-03
+
+First release
+
+[Unreleased]: https://github.com/rlanvin/php-rrule/compare/v1.0.1...HEAD
+[1.0.1]: https://github.com/rlanvin/php-ip/compare/v1.0.0...v1.0.1