On Tue, 23 Aug 2016 16:54:58 -0700 (PDT)
This tells you the reason literally:
> hint: Updates were rejected because the remote contains work that you
> do not have locally. This is usually caused by another
> repository pushing to the same ref. You may want to first merge
> the remote changes (e.g., hint: 'git pull') before pushing again.
> See the 'Note about fast-forwards' in 'git push --help' for
It's possible to rephrase what Git told you in more words but this
would amount to basically restating what every book on Git says in its
relevant part so please spend a bit of your time for reading up on Git
basics.  might be a good start, and it's recommended that you read
that book completely.
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