Fixed a bug with mercurial releases caused by an undefinied variable … (#1817)

* Fixed a bug with mercurial releases caused by an undefinied variable closes #1816
* Accidentally added a tab before the your contribution line. Removing it

CHANGELOG.md

@@ -7,6 +7,7 @@ Reverse Chronological Order:
 https://github.com/capistrano/capistrano/compare/v3.7.0...HEAD
 
 * Your contribution here!
+* Fixed a bug with mercurial deploys trying to use an undefined variable
 
 ## `3.7.0` (2016-12-10)
 

lib/capistrano/scm/tasks/hg.rake

@@ -28,7 +28,7 @@ namespace :hg do
   task update: :'hg:clone' do
     on release_roles :all do
       within repo_path do
-        hr.update_mirror
+        hg_plugin.update_mirror
       end
     end
   end