Optional NUL after checksum

[vavdb]

Some smart meters can return 00 0D 0A after the checksum instead of just 0D 0A.

[codecov-io]

Codecov Report

Merging #26 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #26   +/-   ##
=======================================
  Coverage   67.78%   67.78%           
=======================================
  Files          12       12           
  Lines         298      298           
  Branches       26       26           
=======================================
  Hits          202      202           
  Misses         94       94           
  Partials        2        2

Impacted Files	Coverage Δ
dsmr_parser/clients/telegram_buffer.py	100% <ø> (ø)	⬆️

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[ndokter]

Thank you. Ive made a new release with your fix included. Due to a lost interest at the moment, i havent taken the time to test it though..