Add a CHANGELOG

CHANGELOG.md

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+## Develop
+
+##### Breaking
+
+##### Enhancements
+
+* Update syntax for Swift 2.2/Xcode 7.3
+  [Virgilio Favero Neto](https://github.com/vfn)
+  [#21](https://github.com/andreacremaschi/GEOSwift/pull/21)
+
+* Added convenience initializers to create Waypoints and Linestrings from points
+  [Andrea Cremaschi](https://github.com/andreacremaschi)
+  [f36c3d44b94a4f543cb9f7161cd6910ca6c30b91](https://github.com/andreacremaschi/GEOSwift/commit/f36c3d44b94a4f543cb9f7161cd6910ca6c30b91)
+
+* Restore MapboxGL 
+  [Andrea Cremaschi](https://github.com/andreacremaschi)
+  [0aab3662ce425d11c72433a699afb82810d7ed71](https://github.com/andreacremaschi/GEOSwift/commit/0aab3662ce425d11c72433a699afb82810d7ed71)
+
+* Added 'covers' and 'nearestPoint' to Geometry, made constructor for Coordinate public
+  [David Ganster](https://github.com/davidganster)
+  [#18](https://github.com/andreacremaschi/GEOSwift/pull/18)
+
+