Support FT.CONFIG command

[dengliming]

A PR for #44

[codecov]

Codecov Report

Merging #50 into master will increase coverage by 4.41%.
The diff coverage is 69.85%.

@@            Coverage Diff             @@
##           master      #50      +/-   ##
==========================================
+ Coverage   68.10%   72.52%   +4.41%     
==========================================
  Files          12       12              
  Lines         925     1059     +134     
==========================================
+ Hits          630      768     +138     
+ Misses        239      232       -7     
- Partials       56       59       +3     

Impacted Files	Coverage Δ
redisearch/pool.go	85.71% <0.00%> (+54.67%)	⬆️
redisearch/schema.go	75.55% <ø> (ø)
redisearch/suggest.go	0.00% <ø> (ø)
redisearch/autocomplete.go	55.67% <44.44%> (+1.50%)	⬆️
redisearch/query.go	74.87% <62.24%> (-11.36%)	⬇️
redisearch/document.go	72.58% <72.41%> (-0.15%)	⬇️
redisearch/client.go	79.12% <89.62%> (+11.67%)	⬆️

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[dengliming]

@filipecosta90 Thanks. Is there anything else need to be done?

[filipecosta90]

@filipecosta90 Thanks. Is there anything else need to be done?

Merging @dengliming . Thank you 👍