[Gemspec] Bump Molinillo to `~> 0.4.4`

Gemfile.lock

@@ -17,10 +17,10 @@ GIT
 
 GIT
   remote: https://github.com/CocoaPods/Molinillo.git
-  revision: 163738c406f5cfc1bb7fbc9487b5ae45b8e82ae4
+  revision: 75a5c1272a68ea76581535a9441d8be64b7dd362
   branch: master
   specs:
-    molinillo (0.4.3)
+    molinillo (0.4.4)
 
 GIT
   remote: https://github.com/CocoaPods/Xcodeproj.git
@@ -108,7 +108,7 @@ PATH
       colored (~> 1.2)
       escape (~> 0.0.4)
       fourflusher (~> 0.3.0)
-      molinillo (~> 0.4.3)
+      molinillo (~> 0.4.4)
       nap (~> 1.0)
       xcodeproj (>= 1.0.0.beta.3, < 2.0)
 

cocoapods.gemspec

@@ -37,7 +37,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'cocoapods-stats',       '>= 1.0.0.beta.3', '< 2.0'
   s.add_runtime_dependency 'cocoapods-trunk',       '>= 1.0.0.beta.2', '< 2.0'
   s.add_runtime_dependency 'cocoapods-try',         '>= 1.0.0.beta.2', '< 2.0'
-  s.add_runtime_dependency 'molinillo',             '~> 0.4.3'
+  s.add_runtime_dependency 'molinillo',             '~> 0.4.4'
   s.add_runtime_dependency 'xcodeproj',             '>= 1.0.0.beta.3', '< 2.0'
 
   s.add_runtime_dependency 'activesupport', '>= 4.0.2'

lib/cocoapods/resolver.rb

@@ -367,7 +367,7 @@ module Pod
     # @param  [Molinillo::ResolverError] error
     #
     def handle_resolver_error(error)
-      message = error.message
+      message = error.message.dup
       case error
       when Molinillo::VersionConflict
         error.conflicts.each do |name, conflict|