[Lib] Automatically detect JSON podspecs when running pod lib lint

Closes https://github.com/CocoaPods/CocoaPods/issues/3477

CHANGELOG.md

@@ -13,6 +13,10 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
   [Samuel Giddins](https://github.com/segiddins)
   [#3471](https://github.com/CocoaPods/CocoaPods/issues/3471)
 
+* Automatically detect JSON podspecs in `pod lib lint`.  
+  [Samuel Giddins](https://github.com/segiddins)
+  [#3477](https://github.com/CocoaPods/CocoaPods/issues/3477)
+
 
 ## 0.37.0.rc.1
 

lib/cocoapods/command/lib.rb

@@ -187,7 +187,7 @@ module Pod
           if !@podspecs_paths.empty?
             Array(@podspecs_paths)
           else
-            podspecs = Pathname.glob(Pathname.pwd + '*.podspec{.yaml,}')
+            podspecs = Pathname.glob(Pathname.pwd + '*.podspec{.json,}')
             if podspecs.count.zero?
               raise Informative, 'Unable to find a podspec in the working ' \
                 'directory'