Bump Xcodeproj to >= 1.5.3, < 2.0

cocoapods.gemspec

@@ -38,7 +38,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'cocoapods-trunk',       '>= 1.3.0', '< 2.0'
   s.add_runtime_dependency 'cocoapods-try',         '>= 1.1.0', '< 2.0'
   s.add_runtime_dependency 'molinillo',             '~> 0.6.1'
-  s.add_runtime_dependency 'xcodeproj',             '>= 1.5.2', '< 2.0'
+  s.add_runtime_dependency 'xcodeproj',             '>= 1.5.3', '< 2.0'
 
   ## Version 5 needs Ruby 2.2, so we specify an upper bound to stay compatible with system ruby
   s.add_runtime_dependency 'activesupport', '>= 4.0.2', '< 5'