[Migrator] Migrate local Ruby podspecs to JSON, allowing updating those pods to work

What 1eb3584a should have been

CHANGELOG.md

@@ -53,6 +53,10 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
   [Samuel Giddins][https://github.com/segiddins]
   [#3141](https://github.com/CocoaPods/CocoaPods/issues/3141)
 
+* Migrate local Ruby podspecs to JSON, allowing updating those pods to work.  
+  [Samuel Giddins](https://github.com/segiddins)
+  [#3038](https://github.com/CocoaPods/CocoaPods/issues/3038)
+
 
 ## 0.36.0.beta.2
 

lib/cocoapods/installer/migrator.rb

@@ -52,6 +52,14 @@ module Pod
         def migrate_to_0_36(sandbox)
           UI.message('Migrating to CocoaPods 0.36') do
             move(sandbox.root + 'Headers/Build', sandbox.root + 'Headers/Private')
+
+            sandbox.specifications_root.children.each do |child|
+              next unless child.basename.to_s =~ /\.podspec$/
+              spec = Specification.from_file(child)
+              child.delete
+              child = Pathname("#{child}.json")
+              child.write(spec.to_pretty_json)
+            end
           end
         end