Add: Maximum Number of Balloons

[awesee]

No description provided.

[codecov]

Codecov Report

Merging #697 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #697      +/-   ##
==========================================
+ Coverage   99.27%   99.28%   +<.01%     
==========================================
  Files         215      216       +1     
  Lines        2216     2228      +12     
==========================================
+ Hits         2200     2212      +12     
  Misses         16       16

Impacted Files	Coverage Δ
...m-number-of-balloons/maximum_number_of_balloons.go	100% <100%> (ø)

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