Fix changelog whitespacing

CHANGELOG.md

@@ -15,6 +15,7 @@ Canonical reference for changes, improvements, and bugfixes for Boundary.
 * api: Fix nil pointer panic that could occur when using TLS
   ([Issue](https://github.com/hashicorp/boundary/pull/902),
   [PR](https://github.com/hashicorp/boundary/pull/901))
+  
 ## 0.1.5 (2021/01/29)
 
 *NOTE*: This version requires a database migration via the new `boundary