[Rakefile] Update release task now that `develop` is gone.

Rakefile

@@ -79,8 +79,8 @@ namespace :gem do
   task :release do
 
     unless ENV['SKIP_CHECKS']
-      if `git symbolic-ref HEAD 2>/dev/null`.strip.split('/').last != 'develop'
-        $stderr.puts "[!] You need to be on the `develop' branch in order to be able to do a release."
+      if `git symbolic-ref HEAD 2>/dev/null`.strip.split('/').last != 'master'
+        $stderr.puts "[!] You need to be on the `master' branch in order to be able to do a release."
         exit 1
       end
 
@@ -120,6 +120,9 @@ namespace :gem do
       exit 1
     end
 
+    # Ensure that the branches are up to date with the remote
+    sh "git pull"
+
     puts "* Running specs"
     silent_sh('rake spec:all')
 
@@ -138,19 +141,11 @@ namespace :gem do
     # ENV['FROM_GEM'] = '1'
     # silent_sh "rake examples:build"
 
-    # Ensure that the branches are up to date with the remote
-    sh "git pull"
-
     # Then release
     sh "git commit lib/cocoapods.rb -m 'Release #{gem_version}'"
-    sh "git push origin develop"
-    sh "git checkout master"
-    sh "git pull"
-    sh "git merge develop -m 'Release #{gem_version}'"
     sh "git tag -a #{gem_version} -m 'Release #{gem_version}'"
     sh "git push origin master"
     sh "git push origin --tags"
-    sh "git checkout develop"
     sh "gem push #{gem_filename}"
 
     # Update the last version in CocoaPods-version.yml