Grayskull

Bugfix 178 . Fix when the list requirements is just a string in _fix_list_requirements

Added option `--strict-conda-forge`, with that enable grayskull will try to generate the recipe to be as close as possible with current conda-forge build.
Fix license discovery on github repositories

Show a better message when the package is missing on PyPI
Add pre-commit hook to sort yaml keys for the pypi configuration file
Add new entries to map different package names on PyPI and conda-forge
Changed CI checkers to run the entire pre-commit in all files and not just the flake8 and plugins
Fix cases where the pypi url was not adding the right filename or right extension to the sdist package
Change grayskull license to Apache-2.0
Fix bare exception to BaseException when handling distutils injection

Add new entry point greyskull

Add LGTM badge
Fix LGTM alerts
Add information about online grayskull
Fix formatting error on README.md
Fix for dependencies which were informed as a sequence of sequences
Fix imports for recipes which do not contain packages and just py_modules
Exclude hidden folders from license discovery

Improvements regarding the output for missing packages
Add python-graphviz to replace graphviz for packages on pypi
Bug fix when the package setup raises an exception which was not covered by Exception