verify(): use formatted strings instead of bytes

[joergschulz]

a proposed fix for #10

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (9e67829) 100.00% compared to head (73ca0f3) 100.00%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #11   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines           97        97           
  Branches         7         7           
=========================================
  Hits            97        97           

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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Files Changed	Coverage Δ
src/otpauth/rfc4226.py	100.00% <100.00%> (ø)
src/otpauth/rfc6238.py	100.00% <100.00%> (ø)

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