Add missing HK public holiday(2015-09-03)

[CarrieMY]

Closes #880

[boring-cyborg]

Thanks for opening this pull request! It might take a while before we look at it, so don't worry if there seems to be no feedback. We'll get to it.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

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[coveralls]

Coverage decreased (-0.001%) to 71.02% when pulling c825b67 on CarrieMY:bugfix into 32f864a on lballabio:master.

[lballabio]

Thank you! Would you mind clicking on the link in the CLAssistant comment above to sign your contribution?

[CarrieMY]

Hi I just found I made a mistake in the commit that my email address is incorrectly put thus CLA cannot be signed. So sorry for this mistake. Let me close this PR and correct it.

[lballabio]

No problem, thanks.