update changelog.md for 3.0

CHANGELOG.md

@@ -1,8 +1,14 @@
-## 0.3.0 (Unreleased)
+## 0.3.0 (2020-01-06)
 
-- the `blocks` command can now return blocks null-seperated ([#25](https://github.com/katbyte/terrafmt/issues/25))
+- add support for `return '` blocks ([#39](https://github.com/katbyte/terrafmt/issues/39))
+- use terraform-exec to manage the terraform executable ([#36](https://github.com/katbyte/terrafmt/issues/36))
 - returns actionable error codes ([#33](https://github.com/katbyte/terrafmt/issues/33))
+- suppot addtional go format verbs ([#31](https://github.com/katbyte/terrafmt/issues/31))
+- add option to mask go format versd in `-blocks` output ([#29](https://github.com/katbyte/terrafmt/issues/29))
+- the `blocks` command can now return blocks null-seperated ([#25](https://github.com/katbyte/terrafmt/issues/25))
 - JSON output format for `blocks` command ([#23](https://github.com/katbyte/terrafmt/issues/23))
+- tolerate whitespace at the beginning of the first line ([#12](https://github.com/katbyte/terrafmt/issues/12))
+- include the terraform version in the output of `version` ([#8](https://github.com/katbyte/terrafmt/issues/8))
 
 ## 0.2.0 (2020-02-29)