Attempt 3 at fixing the exception upon 'pip3 install'

This should fix 2 problems:

• no longer complains about not finding README.md
• no longer requires pypandoc to run 'pip3 install'

Attempt 2 to fix exception during 'pip3 install'

My first attempt fix this exception during pip3 install:

Collecting bigquery-schema-generator
Downloading bigquery-schema-generator-0.1.2.tar.gz
Complete output from command python setup.py egg_info:
Traceback (most recent call last):
File "", line 1, in
File "/private/tmp/pip-build-mr9vuupc/bigquery-schema-generator/setup.py", line 6, in
long_description = pypandoc.convert('README.md', 'rst')
File "/usr/local/lib/python3.6/site-packages/pypandoc/init.py", line 66, in convert
raise RuntimeError("Format missing, but need one (identified source as text as no "
RuntimeError: Format missing, but need one (identified source as text as no file with that name was found).

Doesn't quite work because it then attempts to slurp in the raw README.md file, which it can't find yet again.

Install 'generate-schema' script

Add 'generate-schema' script, installed by 'pip'. Update README.md wi…

…th different ways to invoke script. Update version to 0.1.1.

Initial release to PyPI

Merge pull request #2 from bxparks/develop

Initial release of version 0.1 to PyPI.