Update README with Jitpack

[rogerhu]

No description provided.

[codecov]

Codecov Report

Merging #816 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #816   +/-   ##
=========================================
  Coverage     53.46%   53.46%           
  Complexity     1682     1682           
=========================================
  Files           124      124           
  Lines          9852     9852           
  Branches       1380     1380           
=========================================
  Hits           5267     5267           
  Misses         4156     4156           
  Partials        429      429

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[coveralls]

Coverage remained the same at 57.826% when pulling 9f6bf1b on rogerhu:jitpack into b4beae3 on parse-community:master.