Add changelog

Author: praveenperera

CHANGELOG.MD

@@ -0,0 +1,15 @@
+# CHANGELOG
+
+## [0.2.0]
+
+### User
+* Map is returned with string keys instead of atom keys
+* Now between 5.94x - 49.03x faster than next fastest tested option
+
+### Internal
+* Removed Jason dependecy 
+* Returning elixir map directly instead of returning a stringified JSON and then using Jason to convert it to an elixir map
+
+## [0.1.4]
+* Convert RSS feed into map with atom keys
+* Between 2.85x - 22.05x faster than next fastest tested option