[changelog] set release date

Author: truthbk

CHANGELOG.md

@@ -1,7 +1,7 @@
 Changes
 =======
 
-# 2.1.0 / Unreleased
+# 2.1.0 / 2018-03-06
 
 ### Notes
 
@@ -534,4 +534,4 @@ Please read the [docs]() for more details.
 [@szponek]: https://github.com/szponek
 [@tdm4]: https://github.com/tdm4
 [@teintuc]: https://github.com/teintuc
-[@tuxinaut]: https://github.com/tuxinaut
+[@tuxinaut]: https://github.com/tuxinaut