Allow telegram chat IDs as file

[crazy-max]

Fixes #294

cc @kireque

[codecov]

Codecov Report

Merging #301 (e49cded) into master (46042bd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #301   +/-   ##
=======================================
  Coverage   70.95%   70.95%           
=======================================
  Files           8        8           
  Lines         241      241           
=======================================
  Hits          171      171           
  Misses         44       44           
  Partials       26       26           

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