[gemspec] Bump cocoapods-trunk

Just the last time now

cocoapods.gemspec

@@ -33,7 +33,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'cocoapods-downloader', '~> 0.6.1'
   s.add_runtime_dependency 'cocoapods-plugins',    '~> 0.3.0'
   s.add_runtime_dependency 'cocoapods-try',        '~> 0.4.0'
-  s.add_runtime_dependency 'cocoapods-trunk',      '~> 0.1.4'
+  s.add_runtime_dependency 'cocoapods-trunk',      '~> 0.2.0'
 
   s.add_runtime_dependency 'colored',       '~> 1.2'
   s.add_runtime_dependency 'escape',        '~> 0.0.4'