Add credits for Swift migration participants to the changelog.

Author: Illia Romanenko

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## 3.0.0
-* Migrated to Swift.
+* Migrated to Swift, thanks to Mitch Ross (https://github.com/mitchross), 
+Amadeu Cavalcante (https://github.com/amadeu01) and pharshdev (https://github.com/pharshdev).
 
 ## 2.0.0
 * Improved structure (see example for braking changes), add aspect ratio and payback controls