Often

Fix build index problem in reinstallation

4

As the error code while doing reinstallation(remove and install again): ``` Traceback (most recent call last): File "setup.py", line 52, in cmdclass = {'install': zipcodetw_install}, File "...\lib\site-packages\setuptools-40.8.0-py3.6.egg\setuptools\__init__.py", line 145, in...