Merge pull request #506 from DenHeadless/patch-1

Fix compilation of the project when using Xcode 9 new build system and CocoaPods

Author: Martin Barreto

XLPagerTabStrip.podspec

@@ -9,7 +9,7 @@ Pod::Spec.new do |s|
   s.social_media_url = 'https://twitter.com/xmartlabs'
   s.ios.deployment_target = '8.0'
   s.requires_arc = true
-  s.ios.source_files = 'Sources/**/*'
+  s.ios.source_files = 'Sources/**/*.{h,m,swift}'
   s.ios.frameworks = 'UIKit', 'Foundation'
   s.resource_bundles = { 'XLPagerTabStrip' => ['Sources/ButtonCell.xib'] }
 end