Anon: move "no strict 'ref'" to upper scope to speed up a little.
Add synopsis example xt/file.t
Anon: add SEE ALSO section
xt/file.t: Tie::File is now used with O_RDONLY mode because files in distribution are read-only, including hoge.dat.
Update changes. (oops, I forgot to set the release date of 0.01 ... )