v3.1.0

Improvements

• Made isLTRLanguage open so it can actually be set by users #121.
• Silence warnings due to M_PI being deprecated in Xcode 8.3 #116. Thanks to @z3bi.
• Adds UIAppearance support #118. Thanks to mwfire.
• Fix for RTL issue while editing texts #126. Thanks to @mehrdadmaskull

No Functional Change

• Added swiftlint and cleaned up the source code to conform with it #125. Thanks to @moogle19