Update .travis.yml

[flovilmart]

Adds regular expression to match tags (yes, match tag in branches...)
Tags should follow:

1.0.0
or
1.0.0-alpha

[codecov-io]

Current coverage is 92.82%

Merging #1428 into master will not affect coverage as of 1eab9f5

@@            master   #1428   diff @@
======================================
  Files           86      86       
  Stmts         5460    5460       
  Branches      1007    1007       
  Methods          0       0       
======================================
  Hit           5068    5068       
  Partial         10      10       
  Missed         382     382       

Review entire Coverage Diff as of 1eab9f5

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[flovilmart]

See the publish attempt here: https://travis-ci.org/ParsePlatform/parse-server/jobs/121678019
The other one skipped: https://travis-ci.org/ParsePlatform/parse-server/jobs/121678017