Ruby 2.4.1 testing

Author: Evesy

.github/PULL_REQUEST_TEMPLATE.md

@@ -12,7 +12,7 @@
 
 - [ ] RuboCop passes
 
-- [ ] Existing tests pass 
+- [ ] Existing tests pass
 
 #### New Plugins
 
@@ -24,5 +24,5 @@
 
 #### Purpose
 
-#### Known Compatablity Issues
+#### Known Compatability Issues
 

.travis.yml

@@ -7,6 +7,7 @@ rvm:
 - 2.1
 - 2.2
 - 2.3.0
+- 2.4.1
 notifications:
   email:
     recipients:
@@ -28,4 +29,5 @@ deploy:
     rvm: 2.1
     rvm: 2.2
     rvm: 2.3.0
+    rvm: 2.4.1
     repo: sensu-plugins/sensu-plugins-postgres

CHANGELOG.md

@@ -4,6 +4,9 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 This CHANGELOG follows the format listed at [Keep A Changelog](http://keepachangelog.com/)
 
 ## [Unreleased]
+### Added
+- Ruby 2.4.1 testing
+
 ## [1.2.0] - 2017-07-12
 ### Added
 - metric-postgres-statsdb.rb: Adds new metric `numbackends`. (@phumpal)