Updated changelog

Author: sodamodo

CHANGELOG.md

@@ -13,7 +13,7 @@ and this project adheres to release number versioning.
 - Added Docker containers with docker-compose [#10](https://github.com/CodeForPhilly/third-places/pull/10)
 - Set up Leaflet React component and boiletplate homepage[#7](https://github.com/CodeForPhilly/third-places/issues/7)
 - Added initial Django models & migration [#21](https://github.com/CodeForPhilly/third-places/pull/21)
-- Added buttons at bottom of Map [#28](https://github.com/CodeForPhilly/third-places/issues/28)
+- Added buttons at bottom of Map [#40](https://github.com/CodeForPhilly/third-places/pull/40)
 
 ### Changed
 - Made Leaflet map element fullscreen and rmeoved title[#27](https://github.com/CodeForPhilly/third-places/issues/27)