2.1.0

• #62 from @Botz
  • Add withColor() function for android
• #58 from @killme2008
  • Fixed typo in readme
• #57 from @ralfstuckert
  • Add support for Girocode and Wifi Schemes
• #48 from @atomfrede
  • Cleanup svg and bitmap terminal operators
• #47 from @ArielCabib
  • Enabling configuration of QR color
• #46 from @fadils
  • fix typo in bitmap example in README.md
• #44 from @atomfrede
  • Updated maven central badges in readme