Fix Cite Key with Period not working

[shyamd]

Should fix #170

[codecov]

Codecov Report

Base: 98.24% // Head: 98.24% // No change to project coverage 👍

Coverage data is based on head (45d5fe8) compared to base (32c16ff).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #176   +/-   ##
=======================================
  Coverage   98.24%   98.24%           
=======================================
  Files           3        3           
  Lines         171      171           
=======================================
  Hits          168      168           
  Misses          3        3           

Impacted Files	Coverage Δ
src/mkdocs_bibtex/utils.py	98.95% <100.00%> (ø)

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