Rubocop upgrade and cleanup

Author: eheydrick

bin/check-postgres-replication.rb

@@ -114,10 +114,9 @@ def run
 
     message = "replication delayed by #{lag_in_mb}MB :: master:#{master} slave:#{slave} m_segbytes:#{m_segbytes}"
 
-    case
-    when lag_in_mb >= config[:crit]
+    if lag_in_mb >= config[:crit]
       critical message
-    when lag_in_mb >= config[:warn]
+    elsif lag_in_mb >= config[:warn]
       warning message
     else
       ok message

sensu-plugins-postgres.gemspec

@@ -28,8 +28,7 @@ Gem::Specification.new do |s|
                                'development_status' => 'active',
                                'production_status'  => 'unstable - testing recommended',
                                'release_draft'      => 'false',
-                               'release_prerelease' => 'false'
-  }
+                               'release_prerelease' => 'false' }
   s.name                   = 'sensu-plugins-postgres'
   s.platform               = Gem::Platform::RUBY
   s.post_install_message   = 'You can use the embedded Ruby by setting EMBEDDED_RUBY=true in /etc/default/sensu'