Fix deprecated folder mapping "./" in the "exports" field module resolution (#1456)
Fix deprecated folder mapping "./" in the "exports" field module resolution (#1456)

NodeJS v15.1.0

(node:19936) [DEP0148] DeprecationWarning: Use of deprecated folder mapping "./" in the "exports" field module resolution of the package at D:\0\node_modules\postcss\package.json.
Update this package.json to use a subpath pattern like "./*".
(Use `node --trace-deprecation ...` to show where the warning was created)
postcss/postcss,jonathantneal/postcss,postcss/postcss