Minor fixes to README

[Robyt3]

• Move space outside code block.
• Consistently format "ExcHndl", except in code blocks.
• Consistently format "CatchSegv", except in code blocks.
• Consistently format "Dr. Mingw", except in code blocks.

[codecov-commenter]

Codecov Report

Merging #78 (49b8f06) into master (26bce89) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #78   +/-   ##
=======================================
  Coverage   50.50%   50.50%           
=======================================
  Files          15       15           
  Lines        1964     1964           
  Branches      749      749           
=======================================
  Hits          992      992           
  Misses        747      747           
  Partials      225      225           

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.