Add back unreleased changes section

snoyberg · snoyberg · commit 7010ac33ff31 · 2021-06-28T12:06:52.000+03:00
diff --git a/changelog.md b/changelog.md
@@ -1,5 +1,7 @@
 # Changelog for [`process` package](http://hackage.haskell.org/package/process)
 
+## Unreleased changes
+
 ## 1.6.12.0 *June 2021*
 
 * Add function `getCurrentPid` to get the currently executing process' ID [#205](https://github.com/haskell/process/pull/205)
