add backticks for method names

Release version 0.4.6

Merge branch 'master' of github.com:tehmaze/xmodem

Merge pull request #22 from tehmaze/bugfix-block-persisting-retry

Bugfix block persisting retry

Merge pull request #20 from tehmaze/gadelavega-mergepr-19

Gadelavega mergepr 19

Bump for 0.4.2 release fixing #16

bump for 0.4.1 release

Bump version

Fixed bug in NACK resend (bug report by Dean Copsey)

Sequence numbering bug fix