Remove deprecated functions

[yakky]

No description provided.

[coveralls]

Coverage remained the same at 98.261% when pulling c908c1e on bugfix/deprecated-functions into a0c2a61 on master.

[codecov]

Codecov Report

Merging #17 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #17   +/-   ##
=======================================
  Coverage   97.22%   97.22%           
=======================================
  Files           3        3           
  Lines         108      108           
  Branches        9        9           
=======================================
  Hits          105      105           
  Misses          2        2           
  Partials        1        1           

Impacted Files	Coverage Δ
knocker/mixins.py	100.00% <100.00%> (ø)

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