Change pacakge name

[mapx]

It resolves #5.

[CNMan]

刚好遇到这个问题 安装目录和 https://pypi.org/project/ipdb/ 相同，以致两个包都不能用了

>pip uninstall ipdb
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Ple
ase upgrade your Python as Python 2.7 won't be maintained after that date. A fut
ure version of pip will drop support for Python 2.7. More details about Python 2
 support in pip, can be found at https://pip.pypa.io/en/latest/development/relea
se-process/#python-2-support
Uninstalling ipdb-0.12.2:
  Would remove:
    e:\pathfiles\python27\lib\site-packages\ipdb-0.12.2-py2.7.egg-info
    e:\pathfiles\python27\lib\site-packages\ipdb\*
    e:\pathfiles\python27\scripts\ipdb-script.py
    e:\pathfiles\python27\scripts\ipdb.exe
    e:\pathfiles\python27\scripts\ipdb.exe.manifest
  Would not remove (might be manually added):
    e:\pathfiles\python27\lib\site-packages\ipdb\base_station.py
    e:\pathfiles\python27\lib\site-packages\ipdb\city.py
    e:\pathfiles\python27\lib\site-packages\ipdb\database.py
    e:\pathfiles\python27\lib\site-packages\ipdb\district.py
    e:\pathfiles\python27\lib\site-packages\ipdb\exceptions.py
    e:\pathfiles\python27\lib\site-packages\ipdb\idc.py
    e:\pathfiles\python27\lib\site-packages\ipdb\util.py
Proceed (y/n)?

建议 @mapx 将ipdb_py改为ipip_ipdb，和 https://pypi.org/project/ipip-ipdb/ 保持一致