Update podspec.

Author: inamiy

SwiftTask.podspec

@@ -1,13 +1,11 @@
 Pod::Spec.new do |s|
   s.name     = 'SwiftTask'
-  s.version  = '2.5.1'
+  s.version  = '2.6.0'
   s.license  = { :type => 'MIT' }
   s.homepage = 'https://github.com/ReactKit/SwiftTask'
   s.authors  = { 'Yasuhiro Inami' => '[email protected]' }
   s.summary  = 'Promise + progress + pause + cancel + retry, using SwiftState (state machine).'
   s.source   = { :git => 'https://github.com/inamiy/SwiftTask.git', :tag => "#{s.version}" }
   s.source_files = 'SwiftTask/**/*.{h,swift}'
   s.requires_arc = true
-  
-  s.dependency 'SwiftState', '~> 1.1.1'
 end