Make version in changelog fit release version.

I know this is somewhat of a nitpicky change but I stumbled across this error when I reviewed results of an automatic changelog parser for [Depfu](https://depfu.com) I'm working on and I think this mismatch may confuse users as well as our robots.
flavorjones · Oct 29, 2018 · ede15b9 · ede15b9
1 parent 82af422
commit ede15b9
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,4 +1,4 @@
-### 2.2.1 / 2017-09-13
+### 2.3.0 / 2017-09-13
 
 #### Enhancements