Bump health_check gem to version 2.6.0

Gemfile

@@ -344,7 +344,7 @@ gem 'oauth2', '~> 1.2.0'
 gem 'paranoia', '~> 2.2'
 
 # Health check
-gem 'health_check', '~> 2.2.0'
+gem 'health_check', '~> 2.6.0'
 
 # System information
 gem 'vmstat', '~> 2.3.0'

Gemfile.lock

@@ -336,7 +336,7 @@ GEM
       thor
       tilt
     hashie (3.5.5)
-    health_check (2.2.1)
+    health_check (2.6.0)
       rails (>= 4.0)
     hipchat (1.5.2)
       httparty
@@ -895,7 +895,7 @@ DEPENDENCIES
   grape-entity (~> 0.6.0)
   haml_lint (~> 0.21.0)
   hamlit (~> 2.6.1)
-  health_check (~> 2.2.0)
+  health_check (~> 2.6.0)
   hipchat (~> 1.5.0)
   html-pipeline (~> 1.11.0)
   html2text

app/controllers/admin/health_check_controller.rb

 class Admin::HealthCheckController < Admin::ApplicationController
   def show
-    @errors = HealthCheck::Utils.process_checks('standard')
+    @errors = HealthCheck::Utils.process_checks(['standard'])
   end
 end

spec/controllers/health_check_controller_spec.rb

@@ -64,8 +64,8 @@ describe HealthCheckController do
 
     context 'when a service is down and an access token is provided' do
       before do
-        allow(HealthCheck::Utils).to receive(:process_checks).with('standard').and_return('The server is on fire')
-        allow(HealthCheck::Utils).to receive(:process_checks).with('email').and_return('Email is on fire')
+        allow(HealthCheck::Utils).to receive(:process_checks).with(['standard']).and_return('The server is on fire')
+        allow(HealthCheck::Utils).to receive(:process_checks).with(['email']).and_return('Email is on fire')
       end
 
       it 'supports passing the token in the header' do