README: more details about wildcards
README: more details about wildcards

as requested in #17

pombredanne/pyahocorasick,WojciechMula/pyahocorasick,pombredanne/pyahocorasick,woakesd/pyahocorasick,WojciechMula/pyahocorasick,WojciechMula/pyahocorasick,WojciechMula/pyahocorasick,pombredanne/pyahocorasick,woakesd/pyahocorasick,pombredanne/pyahocorasick