Update changelog for Shipper v0.7

CHANGELOG-0.7.md

@@ -9,3 +9,39 @@
   migration will no longer happen. If you're upgrading Shipper from an earlier
   version, we recommend that you first upgrade to v0.6.0, so your
   InstallationTargets can be migrated properly.
+
+## Improvements
+
+* Shipper no longer ships with resyncs enabled by default. This means that we
+  no longer reprocess objects over and over again, and as a result a Shipper
+  instance managing a lot of applications is a lot faster. [Issue
+  #78](https://github.com/bookingcom/shipper/issues/78) [PR
+  #213](https://github.com/bookingcom/shipper/pull/213) and too many others to
+  list.
+
+* Controllers now emit fewer events in general ([PR
+  #222](https://github.com/bookingcom/shipper/pull/222)), and mostly only emit
+  events for condition changes ([PR
+  #217](https://github.com/bookingcom/shipper/pull/217)).
+
+### Bug Fixes
+
+* Traffic Controller now watches changes to Pod objects to immediately apply
+  traffic changes instead of waiting for resyncs. [Issue
+  #206](https://github.com/bookingcom/shipper/issues/206) [PR
+  #210](https://github.com/bookingcom/shipper/pull/210).
+
+* Installation Controller now watches for Service and Deployment objects being
+  deleted, and reinstalls them to prevent Releases being stuck due to those
+  objects being missing. [Issue
+  #110](https://github.com/bookingcom/shipper/issues/110) [PR
+  #205](https://github.com/bookingcom/shipper/pull/205).
+
+* Installation Controller no longer tries to replace objects created by a
+  different application. [Issue
+  #98](https://github.com/bookingcom/shipper/issues/98) [PR
+  #223](https://github.com/bookingcom/shipper/pull/223).
+
+* Installation Controller now knows how to handle multiple objects inside the
+  same YAML file in charts. [PR
+  #216](https://github.com/bookingcom/shipper/pull/216).