Updated CHANGES
Releasing 2.5.0
Updated CHANGES
Remove Match#method_missing, add Match#capture(name)

Match#method_missing is unsafe as illustrated in Github issue #41.
In particular, it makes composing a grammar with aribitrary gems
unsafe when the latter make core extensions, leads to unexpected
results with labels matching Kernel methods (e.g. `p`), and
prevents the Match class from getting new methods in a backward
compatible way. This commit therefore removes it.

A convenient method is provided to get a single capture by label
name. Calling string operators must now be done via Match#to_str.