0.05
        - ProhibitUnusedImport: ignore Getopt::Long for it has special argument spec.
        - ProhibitUnusedConstant: avoid a case of false positive.

0.04
        - ProhibitUnusedImport: ignore all pragmas.
        - add: ProhibitExcessiveColons

0.03
        - add: ProhibitLargeBlock
        - add: ProhibitLargeTryBlock

0.02
	- minor

0.01
	- The beginning, with some primitive but useful new policies.