Remove unexplicit dependency on ActiveSupport

The dependency wasn't declared in the plugin dependencies (I'm not sure how
it could have worked before?)

Author: multani

CHANGELOG.md

@@ -5,6 +5,9 @@ This CHANGELOG follows the format listed [here](https://github.com/sensu-plugins
 
 ## [Unreleased]
 
+### Fixed
+- Remove unexplicit dependency on ActiveSupport (@multani)
+
 ## [2.2.1] - 2018-10-16
 ### Security
 - updated yard dependency to `~> 0.9.11` per: https://nvd.nist.gov/vuln/detail/CVE-2017-17042 (@majormoses)

bin/metric-postgres-statsdb.rb

@@ -29,7 +29,6 @@
 #   for details.
 #
 
-require 'active_support/core_ext/hash'
 require 'sensu-plugins-postgres/pgpass'
 require 'sensu-plugin/metric/cli'
 require 'pg'
@@ -95,7 +94,8 @@ def run
     ]
     con.exec(request.join(' ')) do |result|
       result.each do |row|
-        row.except('datid', 'stats_reset').each do |key, value|
+        row.each do |key, value|
+          next if %w[datid stats_reset].include?(key)
           output "#{config[:scheme]}.statsdb.#{config[:database]}.#{key}", value.to_s, timestamp
         end
       end