Revert "[Gemspec] Bump Molinillo to `'~> 0.5.2'`"

This reverts commit b6a874aa.

Gemfile.lock

@@ -7,7 +7,7 @@ GIT
 
 GIT
   remote: https://github.com/CocoaPods/Core.git
-  revision: c64f9eb98ca18c92f00b649fe5ba20a6f35c34d0
+  revision: 43e49886779442cf23b1a7249a2684104f2b7147
   branch: master
   specs:
     cocoapods-core (1.1.1)
@@ -17,10 +17,10 @@ GIT
 
 GIT
   remote: https://github.com/CocoaPods/Molinillo.git
-  revision: 507f4b047d4ed26f5729e34cc945222414a120b3
+  revision: a1d1a7c9f2ffa8247c8e01b3861c519c8e36cdee
   branch: master
   specs:
-    molinillo (0.5.2)
+    molinillo (0.5.1)
 
 GIT
   remote: https://github.com/CocoaPods/Xcodeproj.git
@@ -109,7 +109,7 @@ PATH
       escape (~> 0.0.4)
       fourflusher (~> 2.0.1)
       gh_inspector (~> 1.0)
-      molinillo (~> 0.5.2)
+      molinillo (~> 0.5.1, != 0.5.2)
       nap (~> 1.0)
       xcodeproj (>= 1.3.3, < 2.0)
 
@@ -277,4 +277,4 @@ DEPENDENCIES
   xcodeproj!
 
 BUNDLED WITH
-   1.12.5
+   1.13.5

cocoapods.gemspec

@@ -37,7 +37,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'cocoapods-stats',       '>= 1.0.0', '< 2.0'
   s.add_runtime_dependency 'cocoapods-trunk',       '>= 1.1.1', '< 2.0'
   s.add_runtime_dependency 'cocoapods-try',         '>= 1.1.0', '< 2.0'
-  s.add_runtime_dependency 'molinillo',             '~> 0.5.2'
+  s.add_runtime_dependency 'molinillo',             '~> 0.5.1', '!= 0.5.2'
   s.add_runtime_dependency 'xcodeproj',             '>= 1.3.3', '< 2.0'
 
   ## Version 5 needs Ruby 2.2, so we specify an upper bound to stay compatible with system ruby