CHANGELOG.md in pesapal-1.5.5 vs CHANGELOG.md in pesapal-1.5.6

@@ -1,7 +1,14 @@
 Changelog
 =========
 
+v1.5.6
+------
+
+* Stop using deprecated OpenSSL::Digest::Digest
+* Enforce minimum required Ruby version, gem is test for Ruby '>= 1.9.2' afterall
+* Refactor tests
+
 v1.5.5
 ------
 
 * Improve code formatting
 * Add comprehensive inline documentation (Yard)