read_up_to()

[jwodder]

Closes #54.

[codecov]

Codecov Report

Attention: Patch coverage is 92.59259% with 2 lines in your changes missing coverage. Please review.

Project coverage is 87.51%. Comparing base (a2e0355) to head (ed7ac76).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/io/read_up_to.rs	92.59%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
+ Coverage   87.45%   87.51%   +0.06%     
==========================================
  Files          34       35       +1     
  Lines        2184     2211      +27     
==========================================
+ Hits         1910     1935      +25     
- Misses        274      276       +2     

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