python setup.py incorrect path

[Kangcheng Hou]

Here I am reporting two incorrect path in setup.py (i was trying to install with pip install -e . at 2.0/Python)
which is modified in commit 16a462e

1. src/pgenlib/pgenlib.pyx seems to be incorrect?
   

   plink-ng/2.0/Python/setup.py

   Line 11 in 779a2a0

    sources = ['src/pgenlib/pgenlib.pyx', 'src/plink2/pgenlib_ffi_support.cc', 'src/plink2/include/pgenlib_misc.cc', 'src/plink2/include/pgenlib_read.cc', 'src/plink2/include/pgenlib_write.cc', 'src/plink2/include/plink2_base.cc', 'src/plink2/include/plink2_bits.cc'], 

2. README.md should be ReadMe.md, or vice versa
   

   plink-ng/2.0/Python/setup.py

   Line 23 in 779a2a0

    with open("README.md", "r", encoding="utf-8") as fh: 

As always, thanks for this great library

[Christopher Chang]

Oops, I forgot to propagate part of this update; thanks for reporting this. Let me know if you still have a problem with this after 67aaf03 .