3.1.0

Fixed frame error #29, #30,#31

Swift5 + AutoLayout

Migrate to Swift5 version and change internal layout to AutoLayout

Carthage compatibility for Swift

Carthage compatibility for Swift

Upgrade project to Xcode 10, Swift4.2

2.2.0

support Xcode10 and Swift4.2

Upgrade project to Xcode 9.3, Swift4.1

1. 支持Xcode9.3, Swift4.1 <-> support Xcode9.3 and Swift4.1

2. Update
   Objc: - (void)pp_setBadgeHeightPoints:(CGFloat)points
   ==> - (void)pp_setBadgeHeight:(CGFloat)height
   Swift: func setBadgeHeight(points: CGFloat)
   ==> func setBadge(height: CGFloat)

3. Add: (fix issus #8 )
   Objc: - (void)pp_setBadgeFlexMode:(PPBadgeViewFlexMode)flexMode;
   Swift: func setBadge(flexMode: PPBadgeViewFlexMode = .tail)

Support iOS11 and Swift4

Support iOS11 and Swift4, fix bug #4