adds consistency to changelog

CHANGELOG.md

@@ -1,12 +1,15 @@
 # Changelog
 
-## 0.2.3
+## 1.0.0 (UNRELEASED)
+Major updates to Terrascan and the underlying architecture.
+
+## 0.2.3 (2020-07-23)
 * Introduces the '-f' flag for passing a list of ".tf" files for linting and the '--version' flag.
 
-## 0.2.2
+## 0.2.2 (2020-07-21)
 * Adds Docker image and pipeline to push to DockerHub
 
-## 0.2.1
+## 0.2.1 (2020-06-19)
 * Bugfix: The pyhcl hard dependency in the requirements.txt file caused issues if a higher version was installed. This was fixed by using the ">=" operator.
 
 ## 0.2.0 (2020-01-11)