README.md: Added reference to the changelog.

Makefile

@@ -12,6 +12,7 @@ download-dependencies:
 clean:
 	rm -f *.min.js
 	rm -f export.*.json
+	rm -f README.html
 
 test-dev: diff-test
 

README.md

@@ -66,6 +66,7 @@ For version 2.2.0 and all following, the following applies:
 * The minor release is increased if new features are added.
 * The patch level is increased to bundle a bunch of commits (minor changes like bug fixes and improvements) into a new tested version.
 
+Check [releases on GitHub] for a list of the releases and there changelog.
 
 ## Synopsis
 
@@ -644,7 +645,8 @@ opening_hours.js is published under the New (2-clause) BSD license.
 <!-- Links {{{ -->
 [Nominatim]: http://wiki.openstreetmap.org/wiki/Nominatim#Reverse_Geocoding_.2F_Address_lookup
 [fossgis-project]: http://wiki.openstreetmap.org/wiki/FOSSGIS/Server/Projects/opening_hours.js
-[issue-report]: https://github.com/ypid/opening_hours.js/issues
+[issue-report]: /issues
+[releases on github]: /releases
 [Key:opening_hours]: http://wiki.openstreetmap.org/wiki/Key:opening_hours
 [oh:specification]: http://wiki.openstreetmap.org/wiki/Key:opening_hours/specification
 [oh:specification:fallback rule]: https://wiki.openstreetmap.org/wiki/Key:opening_hours/specification#fallback_rule_separator