Version 0.2.21-beta-release

Updates introduced since 0.2.20-beta-release

• 2ab2721 Bump copyright date - (NI) 4AC3E3D5FDD208F7 U
• 8dd7c66 Upgrade dependencies - (NI) 4AC3E3D5FDD208F7 U
• bbbfc7e Update the Credit section in README.md - (NI) 4AC3E3D5FDD208F7 U
• 5d3e219 Merge pull request #74 from Tweak4141/master - (R+) 4AEE18F83AFDEB23 E
• f024346 Update README.md - (Tweak) 4AEE18F83AFDEB23 E
• e3e4bb0 Update README.md - (Tweak) 4AEE18F83AFDEB23 E
• e767c08 Update controller.go - (Tweak) 4AEE18F83AFDEB23 E
• 55da265 Update README.md - (Tweak) 4AEE18F83AFDEB23 E