:rotating_light: Edit for forward compatibility

[yeop-sang]

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Edit urls.py files for forward compatibility and Change xlrd version for pyexcel-xls.

This commit is fixing the issue #73.

With your PR, here is a check list:

• [ ] Has test cases written? - Don't need Just change some codes
• [x] Has all code lines tested?
• [x] Has make format been run?
• [x] Please update CHANGELOG.yml(not CHANGELOG.rst)
• [ ] Passes all Travis CI builds
• [x] Has fair amount of documentation if your change is complex
• [x] Agree on NEW BSD License for your contribution