Fix parsing hardened indexes with apostroph

[dr-orlovsky]

Closes #14

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (b4c869f) 0.0% compared to head (5985f0d) 0.0%.

Files	Patch %	Lines
derive/src/index.rs	0.0%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##           master    #17   +/-   ##
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  Coverage     0.0%   0.0%           
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  Files          17     17           
  Lines        3157   3157           
=====================================
  Misses       3157   3157           

Flag	Coverage Δ
rust	0.0% <0.0%> (ø)

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