v2.2.2

This release of Grab changes the way that exit status codes are handled.
In previous releases Grab would exit with exit code 0 unless an error
occured in which case it would exit with 1.  The exit code 2 occured
when -U was passed but PCRE support wasn’t available.

In this release, all error conditions besides that of exit code 2 now
return exit code 3, and exit code 1 is now used to signify a successful
operation which failed to match any patterns.
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