String.join is not supported in Android

See #50, release log:

• fccf000 by @rultor: 0.0.4-SNAPSHOT
• 4f5c826 by @ammaratef45: #50 update charsequences
• e74edd7 by @ammaratef45: #50 make charsequences private
• f9fad8c: #50 resolve comments
• 71b6cb9: #50 created a join function fo...

Released by Rultor 1.68.2, see build log