updated airmail-beta (2.6.1,356) (#1957)

Casks/airmail-beta.rb

@@ -1,11 +1,11 @@
 cask 'airmail-beta' do
-  version '2.6.1,355'
-  sha256 'ac6abb0be3ce0c815bc582fdce1e799b89daf9417896887c36496df3ffccab69'
+  version '2.6.1,356'
+  sha256 '6c2042d8b00df49648b2f839a3adc8137bd54ed3046368b2973d8a4b4dd2ec83'
 
   # hockeyapp.net/api/2/apps/84be85c3331ee1d222fd7f0b59e41b04 was verified as official when first introduced to the cask
   url 'https://rink.hockeyapp.net/api/2/apps/84be85c3331ee1d222fd7f0b59e41b04?format=zip'
   appcast 'https://rink.hockeyapp.net/api/2/apps/84be85c3331ee1d222fd7f0b59e41b04',
-          checkpoint: 'a80cfdee62d07f76c4c47e54e17edc35b817c7279eadade786bcc0448392701b'
+          checkpoint: '7a134c5fb0300ab7a2f465afc2a4dd81a4f8ca215508b2da7dafbb5631a1ba6c'
   name 'AirMail'
   homepage 'http://airmailapp.com/beta/'
   license :commercial