Add: Valid Perfect Square

[awesee]

No description provided.

[codecov]

Codecov Report

Merging #738 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #738      +/-   ##
=========================================
+ Coverage    99.3%   99.3%   +<.01%     
=========================================
  Files         228     229       +1     
  Lines        2309    2313       +4     
=========================================
+ Hits         2293    2297       +4     
  Misses         16      16

Impacted Files	Coverage Δ
...blems/valid-perfect-square/valid_perfect_square.go	100% <100%> (ø)

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