prep for 3.0.3 release

Author: majormoses

.github/PULL_REQUEST_TEMPLATE.md

@@ -4,7 +4,7 @@
 
 #### General
 
-- [ ] Update Changelog following the conventions laid out on [Keep A Changelog](http://keepachangelog.com/)
+- [ ] Update Changelog following the conventions laid out [here](https://github.com/sensu-plugins/community/blob/master/HOW_WE_CHANGELOG.md)
 
 - [ ] Update README with any necessary configuration snippets
 

CHANGELOG.md

@@ -1,14 +1,17 @@
-#Change Log
+# Change Log
 This project adheres to [Semantic Versioning](http://semver.org/).
 
-This CHANGELOG follows the format listed at [Keep A Changelog](http://keepachangelog.com/)
+This CHANGELOG follows the located [here](https://github.com/sensu-plugins/community/blob/master/HOW_WE_CHANGELOG.md)
 
 ## [Unreleased]
 
-## [3.0.3] - 2017-09-21
+## [3.0.3] - 2017-09-23
 ### Fixed
 - metrics-memory-percent.rb, metrics-memory.rb: change 'usedWOBuffersCaches' and 'freeWOBuffersCaches' calculation to use MemAvailable in /proc/meminfo when available. (@jpoizat)
 
+### Added
+- update CHANGELOG guidelines location (@majormoses)
+
 ## [3.0.2] - 2017-07-31
 ### Fixed
 - check-memory-percent.rb, check-memory.rb: fix shell call response when running on non en_US locale systems (@stefan-walluhn)