Update Cocoa podspec to support Swift 5.1.1

• Removed swift_version from the podspec. PinLayout supports all recent Swift versions, don't need to specify them individually.

Set Cocoapod swift versions to : 4.2, 5.0, 5.1

Update podspec to specify explicitly supported swift versions: ['4.2', '5.0', '5.1']

Improve method that validates `width` and `height` values

• Method that set the width and height now validates more their parameter, by checking NaN and Infinity values.
  • Added by Luc Dion in Pull Request #206

Usage `UIView.effectiveUserInterfaceLayoutDirection` to detect RTL

• Use UIView.effectiveUserInterfaceLayoutDirection to detect RTL on iOS 10 and above. This is recommended approach to detect layout direction taking into account view's semantic content attribute, trait environment and UIApplication layout direction.
  • Added by MontakOleg in Pull Request #200
• Update Travis to Xcode 11.
  • Added by Luc Dion in Pull Request #202

Upgrade to Swift 5

• Upgrade project to Swift 5
• Update Pods
• Apply xcodeproj migration

Added by Luc Dion in Pull Request #195

Update Swift Package Manager support for Xcode 11

• Updated PinLayout to be used with Xcode 11's Swift Package Manager.

  • Added by Hal Lee in Pull Request #192

• Fix Warnings: public' modifier is redundant for instance method declared in a public extension.

  • Added by MontakOleg in Pull Request #193

Add missing Objective-C API methods

• wrapContent
• wrapContentWithPadding:(CGFloat)
• wrapContentWithInsets:(PEdgeInsets)
• wrapContentWithType:(WrapType)
• wrapContentWithType:(WrapType) padding:(CGFloat)
• wrapContentWithType:(WrapType) insets:(PEdgeInsets)

Update support for Swift 4.2

The PinLayout pod doesn't specify anymore the Swift language version.

PinLayout supports Swift versions:

• Swift 4.2 / 4.1 / 4.0

• Swift 3.*

• Added by Luc Dion in Pull Request #178

Minor internal changes

Remove sizeToFit() from SizeCalculable protocol.
This change ensure that PinLayout pin.sizeToFit() method behave correctly. As per the iOS documentation, we should not directly override sizeToFit() but rather always only implement sizeThatFits(_:) for auto-sizing needs. This update aim to remove the sizeToFit() requirement in the SizeCalculable protocol.

• Added by Antoine Lamy in Pull Request #164

Minor changes

• Cleanup .xcodeproj

• Removed Swiftlint warnings

• Fix an issue with PinLayoutSample app related to IntroRTLView example

• Added by Luc Dion in Pull Request #177