Add CHANGELOG entry for v0.18

CHANGELOG.md

@@ -1,3 +1,15 @@
+<a name="v0.18.0"></a>
+## v0.18.0 (2019-01-05)
+
+#### Breaking Changes
+
+* Change `Registered::complete` to take the receiver by reference
+
+#### Features
+
+* Add `Registered::into_parts` and `Registered::from_parts`
+* Add `FromStr` implementation for `Scopes`
+
 <a name="v0.17.0"></a>
 ## v0.17.0 (2018-12-12)
 
@@ -12,6 +24,7 @@
 #### Breaking Changes
 
 * Change `u64` ids to `&str` [9a08058](9a080583f0577d3f77eaf7be55758835c56ea61e)
+* Fixes `follow` to return a `Relationship` [6f63fef](6f63fef0b2414099c55e36107aab785f689d19b6)
 
 <a name="v0.16.0"></a>
 ## v0.16.0 (2018-10-03)