Add backwards compatibility with RedisGraph v2.0.x

[jeffreylovitz]

No description provided.

[codecov]

Codecov Report

Merging #10 into master will decrease coverage by 1.83%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
- Coverage   93.33%   91.50%   -1.84%     
==========================================
  Files           5        5              
  Lines         195      200       +5     
==========================================
+ Hits          182      183       +1     
- Misses         13       17       +4     

Impacted Files	Coverage Δ
lib/redisgraph/query_result.rb	87.17% <33.33%> (-4.61%)	⬇️

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