[Gemspec] Bump Xcodeproj to `>= 1.4.0, < 2.0.0`

Gemfile.lock

@@ -31,10 +31,10 @@ GIT
 
 GIT
   remote: https://github.com/CocoaPods/Xcodeproj.git
-  revision: 1e00e5991cd61d7e175943d0adafe527f6b2b253
+  revision: 2920db2b76b5b7faf8f975f19b5224fab5ee9b2a
   branch: master
   specs:
-    xcodeproj (1.3.3)
+    xcodeproj (1.4.0)
       CFPropertyList (~> 2.3.3)
       activesupport (>= 3)
       claide (>= 1.0.1, < 2.0)
@@ -121,7 +121,7 @@ PATH
       molinillo (~> 0.5.1, != 0.5.2)
       nap (~> 1.0)
       ruby-macho (~> 0.2.5)
-      xcodeproj (>= 1.3.3, < 2.0)
+      xcodeproj (>= 1.4.0, < 2.0)
 
 GEM
   remote: https://rubygems.org/
@@ -290,4 +290,4 @@ DEPENDENCIES
   xcodeproj!
 
 BUNDLED WITH
-   1.13.5
+   1.13.6

cocoapods.gemspec

@@ -38,7 +38,7 @@ Gem::Specification.new do |s|
   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',             '~> 0.5.1', '!= 0.5.2'
-  s.add_runtime_dependency 'xcodeproj',             '>= 1.3.3', '< 2.0'
+  s.add_runtime_dependency 'xcodeproj',             '>= 1.4.0', '< 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'