support operator(>,>=,<,<=,Like).

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@9db39e6). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #73   +/-   ##
=========================================
  Coverage          ?   97.99%           
=========================================
  Files             ?        6           
  Lines             ?      349           
  Branches          ?       60           
=========================================
  Hits              ?      342           
  Misses            ?        7           
  Partials          ?        0

Impacted Files	Coverage Δ
lib/operator.js	100% <100%> (ø)

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