Remove badges from the Cargo.toml

[stanislav-tkach]

See #194 for details.

[codecov-commenter]

Codecov Report

Merging #195 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #195   +/-   ##
=======================================
  Coverage   83.00%   83.00%           
=======================================
  Files          12       12           
  Lines         453      453           
=======================================
  Hits          376      376           
  Misses         77       77           

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