doc: get rid of sneaky hard tabs in CHANGELOG

My editor did something strange. Sorry about that

PR-URL: #6608
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: Myles Borins

CHANGELOG.md

@@ -6,7 +6,7 @@
 
 * **deps**:
   * update openssl to 1.0.2h. (Shigeki Ohtsu) [#6551](https://github.com/nodejs/node/pull/6551)
-		- Please see our [blog post](https://nodejs.org/en/blog/vulnerability/openssl-may-2016/) for more info on the security contents of this release.
+    - Please see our [blog post](https://nodejs.org/en/blog/vulnerability/openssl-may-2016/) for more info on the security contents of this release.
 
 ### Commits