Bump the needed GCC version from 4.8 to 4.9 in README (#1).
Bump the needed GCC version from 4.8 to 4.9 in README (#1).

GCC 4.8 does not fully support <regex>, see e.g.
http://stackoverflow.com/questions/12530406/is-gcc-4-8-or-earlier-buggy-about-regular-expressions

s3rvac/cpp-bencoding,s3rvac/cpp-bencoding