Add CHANGELOG.md

Author: sylux6

CHANGELOG.md

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+# Changelog
+
+## 2.0.0 (2019-12-09)
+
+### Breaking changes
+
+- **Version** class attribute type has changed
+    - `databaseVersion`: `String` -> `Int`
+    
+### Misc
+
+- **reloadDatabase**: updates only if there is a an available new version
+
+## 1.0.0 (2019-12-08)
+
+First public release
+
+### New features
+
+- **getVersion**: returns API version
+- **reloadDatabase**: updates database
+
+## 0.1.0 (2019-12-07)
+
+Pre release
+
+### New features
+
+- **getShipByName**: returns the closest ship which name matches the requested name
+- **getShipById**: returns ship with the given ID
+- **getAllShips**: returns a list of all available ships in database