Add feature #117 to the changelog for JS client 3.0.0

Signed-off-by: Florian Fendt <Florian.Fendt@bosch.io>

javascript/CHANGELOG.md

@@ -17,6 +17,9 @@ and deleting the definition of a Thing.
 ### \#111 allow setting custom api-path
 Adds a new builder step for the client, which allows setting a custom path instead of the default `/api` or `/ws`.
 
+### \#117 add basic support for _metadata
+Adds basic support for `Metadata` in the `Thing` model. Does not yet allow setting metadata from the client.
+
 ### Breaking changes
 * `Features`: Needs to be accessed using `thing.features` instead of `thing.features.features`
 * `Features`: `toObject` instance method was removed. Use `Features#toObject` and `Features#fromObject` instead.