update pg gem to latest version

Author: eheydrick

CHANGELOG.md

@@ -3,7 +3,9 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 This CHANGELOG follows the format listed at [Keep A Changelog](http://keepachangelog.com/)
 
-## [Unreleased][unreleased]
+## Unreleased
+### Changed
+- updated pg gem to 0.18.3
 
 ## [0.0.4] - 2015-08-04
 ### Changed

sensu-plugins-postgres.gemspec

@@ -43,7 +43,7 @@ Gem::Specification.new do |s|
   s.version                = SensuPluginsPostgres::Version::VER_STRING
 
   s.add_runtime_dependency 'sensu-plugin', '1.2.0'
-  s.add_runtime_dependency 'pg',           '0.18.2'
+  s.add_runtime_dependency 'pg',           '0.18.3'
 
   s.add_development_dependency 'bundler',                   '~> 1.7'
   s.add_development_dependency 'codeclimate-test-reporter', '~> 0.4'