Add decoding for scalar graph entities

[jeffreylovitz]

No description provided.

[codecov]

Codecov Report

Merging #5 into master will decrease coverage by 2.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master       #5      +/-   ##
==========================================
- Coverage   91.90%   89.83%   -2.08%     
==========================================
  Files           5        5              
  Lines         173      177       +4     
==========================================
  Hits          159      159              
- Misses         14       18       +4     

Impacted Files	Coverage Δ
lib/redisgraph/query_result.rb	84.84% <100.00%> (-5.48%)	⬇️

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