v2.1.2

Merge pull request #15 from dylanshine/2.1.2

Update podspec to Swift 4.2, increment version

v2.1.1

Lowered deployment target to iOS 8.0 thanks to @rivera-ernesto

Version 2.1

This release adds a functional eraser thanks to @BlackMirrorz and several bug fixes

Version 2.0

A whole lot new features:

• brushes: an easy & convenient way to keep track of and modify a line's styles
• drawing history: undo & redo changes
• swiftified code