Update CHANGELOG.md

Author: Paddy

CHANGELOG.md

@@ -3,6 +3,9 @@
 BUG FIXES
 
 * Fixed a bug that would incorrectly mark tests using TestStep.ImportStateVerify as failed if they tested a resource with custom timeouts [GH-576]
+* Fixed a bug where errors destroying infrastructure after tests wouldn't be reported [GH-581]
+* Fixed a bug where test steps that expected a non-empty plan would fail because they had an empty plan, erroneously [GH-580]
+* Fixed a bug where the plan output shown when an unexpected diff was encountered during testing would be shown in JSON instead of a human-readable format [GH-584]
 
 # 2.0.2 (September 10, 2020)