Update CHIPageControl.podspec

Xcode 10.2 and Swift 5 support (ChiliLabs#55)

* Swift 4.2 Support

* Xcode 10.2 and Swift 5 support

Swift 4.2 Support (ChiliLabs#50)

* Swift 4.2 Support

This closes ChiliLabs#39, closes ChiliLabs#40

Added support to Multiple Tint Colors (ChiliLabs#35)

* Added an array of tintColors for the layer's backgrounds on the BasePageControl
* Added support of the TintColors on the different PageControls
* Updated README to show the usage of multiple tint colors
* Added an example of how to add the colored page control

Exposing updateFrame as required for swift-4 (ChiliLabs#33)

Fixes ChiliLabs#24 (ChiliLabs#25)

Merge pull request ChiliLabs#23 from ChiliLabs/fix/issue-22

Fixes ChiliLabs#22

Bugfixes/0.1.1 (ChiliLabs#19)

* This fixes ChiliLabs#16, fixes ChiliLabs#18

Merge pull request ChiliLabs#15 from ChiliLabs/bug/hidesForSinglePage

hidesForSinglePage fix