Update README.md

[RodrigoSMarques]

The service definition "com.parse.fcm.ParseFirebaseMessagingService" was missing the ">" character at the end, causing error in AndroidManifest.xmll

[codecov]

Codecov Report

Merging #883 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #883   +/-   ##
=========================================
  Coverage     64.67%   64.67%           
  Complexity     1898     1898           
=========================================
  Files           122      122           
  Lines          9706     9706           
  Branches       1360     1360           
=========================================
  Hits           6277     6277           
  Misses         2924     2924           
  Partials        505      505

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[coveralls]

Coverage remained the same at 69.874% when pulling 3feff47 on rodrigosmarques:patch-1 into c475694 on parse-community:master.

[Jawnnypoo]

Thanks!