Fix the warnings from .travis.yml
Fix the warnings from .travis.yml

If you execute `travis lint` command, the following warnings is displayed.

Warnings for .travis.yml:
[x] value for notifications section is empty, dropping
[x] in notifications section: unexpected key recipients, dropping

RubyMoney/money,antstorm/money,envato/money,bonusly/money,insphire/money,paulodiniz/money,nilbus/money,richardvenneman/money,printercu/money,BrandyMint/money,kewaunited/money,AlexVPopov/money