Add license info to setup.py so it will show up in wheel installs.

Author: itsbenweeks

setup.py

@@ -37,6 +37,8 @@ def get_version(module='pylsp'):
     name='python-lsp-server',
     version=get_version(),
     description='Python Language Server for the Language Server Protocol',
+    license="MIT",
+    license_file="LICENSE",
     long_description=README,
     long_description_content_type='text/markdown',
     url='https://github.com/python-lsp/python-lsp-server',