Don't mention license twice (#30)

The use of license = {file = 'LICENSE'} results in significant ugliness in the sidebar on PyPI. We don't appear to need it, since the license is already specified in the trove classifiers. This PR removes that entry from the pyproject.toml (and also does a drive-by cleanup of the authors field).

Author: mdickinson

pyproject.toml

@@ -7,10 +7,7 @@ name = 'simplefractions'
 description = 'Find the simplest fraction for a given float or interval'
 readme = 'README.md'
 requires-python = '>=3.6'
-license = {file = 'LICENSE'}
-authors = [
-    {name = 'Mark Dickinson', email = 'dickinsm@gmail.com'}
-]
+authors = [{name = 'Mark Dickinson', email = 'dickinsm@gmail.com'}]
 keywords = ['fractions', 'continued fractions', 'approximation']
 classifiers = [
     'License :: OSI Approved :: Apache Software License',