Validator: check license only in root spec

Closes https://github.com/CocoaPods/Core/issues/132

CHANGELOG.md

@@ -5,6 +5,8 @@ To install or update CocoaPods see this [guide](http://docs.cocoapods.org/guides
 
 ## Master
 
+##### Bug Fixes
+
 * Fixed pod repo push to first check if Specs directory exists and if so push there.
   [Edward Valentini](edwardvalentini)
   [#2060](https://github.com/CocoaPods/CocoaPods/issues/2060)
@@ -19,6 +21,10 @@ To install or update CocoaPods see this [guide](http://docs.cocoapods.org/guides
   [Kyle Fuller](kylef)
   [pod-template#50](https://github.com/CocoaPods/pod-template/issues/50)
 
+* Fixed spec linting to not warn for missing license file in subspecs.  
+  [Fabio Pelosin][irrationalfab]
+  [Core#132](https://github.com/CocoaPods/Core/issues/132)
+
 
 ## 0.33.1
 

lib/cocoapods/validator.rb

@@ -351,8 +351,10 @@ module Pod
         end
       end
 
-      unless file_accessor.license || spec.license && ( spec.license[:type] == 'Public Domain' || spec.license[:text] )
-        warning "Unable to find a license file"
+      if consumer.spec.root?
+        unless file_accessor.license || spec.license && ( spec.license[:type] == 'Public Domain' || spec.license[:text] )
+          warning "Unable to find a license file"
+        end
       end
     end