New minecraft version. (1.15)

[xoft]

Dropping 1.2 to 1.4 and keeping 1.5+ would be tricky, because each of those protocols effectively inherits from the previous ones, so the inherited stuff would need to be moved to higher protocols; that would be too much work. A much easier solution is to wait for 1.8 or 1.9, then cut off all pre-1.7 protocols at once - there's no inheritance between 1.6 and 1.7.