Support GeoField GEOFILTER FILTER

[dengliming]

A PR for #61 and #11

[codecov]

Codecov Report

Merging #63 into master will decrease coverage by 0.13%.
The diff coverage is 72.72%.

@@            Coverage Diff             @@
##           master      #63      +/-   ##
==========================================
- Coverage   75.22%   75.08%   -0.14%     
==========================================
  Files          12       12              
  Lines        1118     1160      +42     
==========================================
+ Hits          841      871      +30     
- Misses        220      226       +6     
- Partials       57       63       +6     

Impacted Files	Coverage Δ
redisearch/query.go	79.88% <69.23%> (-1.93%)	⬇️
redisearch/schema.go	89.65% <77.77%> (-2.27%)	⬇️

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[filipecosta90]

thanks @dengliming . Merging 👍