Add needed space in src/main.cpp

[ken-matsui]

No description provided.

[codecov]

Codecov Report

Merging #373 (2ff77e7) into master (4bedc7c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #373   +/-   ##
=======================================
  Coverage   78.16%   78.16%           
=======================================
  Files          52       52           
  Lines        2418     2418           
=======================================
  Hits         1890     1890           
  Misses        528      528           

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