Optimize contraint for unsupported minor core versions

[gapple]

#17 Still includes constraints for each unsupported minor core version instead of a single constraint blocking all older core versions.

e.g.
8.0.4|>=8.0,<8.0.4|8.0.5|8.0.6|>=8.1,<8.1.10|8.1.10|>=8.2,<8.2.8|8.2.8|>=8.3,<8.3.9|8.3.9|>=8.4,<8.4.8|8.4.8|>=8.5,<8.5.15|8.5.15|>=8.6,<8.6.16|>=8.7,<8.7.5

Could be reduced to:
<8.6|>=8.6,<8.6.16|>=8.7,<8.7.5