build: Stricter npm files list

Author: Federico Zivolo

package.json

@@ -1,6 +1,6 @@
 {
   "name": "react-popper",
-  "version": "1.0.0-beta.1",
+  "version": "1.0.0-beta.2",
   "description": "React wrapper around Popper.js",
   "license": "MIT",
   "author": "Travis Arnold <[email protected]> (http://souporserious.com)",
@@ -10,9 +10,9 @@
   "browser": "dist/react-popper.js",
   "typings": "typings/react-popper.d.ts",
   "files": [
-    "dist",
-    "lib",
-    "typings/react-popper.d.ts"
+    "/dist",
+    "/lib",
+    "/typings/react-popper.d.ts"
   ],
   "scripts": {
     "build": "npm run build:clean && npm run build:es && npm run build:cjs && npm run build:browser && npm run build:flow",

rollup.config.js

@@ -17,7 +17,6 @@ const commonOutput = {
   sourcemap: true,
   globals: {
     react: 'react',
-    'prop-types': 'PropTypes',
     'popper.js': 'PopperJS',
     'create-react-context': 'createContext',
     warning: 'warning',