sketch-beta.rb: upgrade to v3.6

Casks/sketch-beta.rb

@@ -1,11 +1,11 @@
 cask 'sketch-beta' do
-  version '3.4.4'
-  sha256 'd07b61e926a8a98f43b760fe10150aaf39ec66ad6fe370fac70fdbbb95923f1e'
+  version '3.6,187'
+  sha256 'cbde5776c1c20a376d5c8827e87f310d0d4093e34ffacedca0ad5806cfe83c12'
 
   # hockeyapp.net/api/2/apps/0172d48cceec171249a8d850fb16276b was verified as official when first introduced to the cask
-  url 'https://rink.hockeyapp.net/api/2/apps/0172d48cceec171249a8d850fb16276b/app_versions/164?format=zip&avtoken=1bf9ed78e68e54974eb9cc9516a216ba82c3f245'
+  url "https://rink.hockeyapp.net/api/2/apps/0172d48cceec171249a8d850fb16276b/app_versions/#{version.after_comma}?format=zip"
   appcast 'https://rink.hockeyapp.net/api/2/apps/0172d48cceec171249a8d850fb16276b',
-          checkpoint: 'c08d7f38314e84bcc3ad2c792c40aedcea49d4d4ba672817386d266efbcae4e2'
+          checkpoint: '14cb48636fa4c6d689a884399d20b9c18cd3ec8ee5d62374d3a0eb70e6f31180'
   name 'Sketch'
   homepage 'http://bohemiancoding.com/sketch/beta/'
   license :commercial