Restore long description (#139)

pyproject.toml

@@ -7,9 +7,16 @@ name='stylist'
 description="Flexible source code style checking tool"
 requires-python = '>=3.7, <4'
 license = {text = 'BSD 3-Clause License'}
-classifiers = ['Programming Language :: Python :: 3']
 dependencies = ['fparser >= 0.1.2']
 dynamic = ['version', 'readme']
+keywords = ['linter', 'fortran']
+classifiers = [
+    'Development Status :: 3 - Alpha',
+    'Intended Audience :: Developers',
+    'Topic :: Software Development :: Quality Assurance',
+    'License :: OSI Approved :: BSD License',
+    'Programming Language :: Python :: 3'
+]
 
 
 [project.optional-dependencies]
@@ -31,7 +38,7 @@ documentation = 'https://metoffice.github.io/stylist'
 repository = 'https://github.com/MetOffice/stylist/'
 
 [tool.setuptools.dynamic]
-readme = {file = 'README.md'}
+readme = {file = 'README.rst'}
 version = {attr = 'stylist.__version__'}
 
 [tool.setuptools.packages.find]