chore(package.json): Remove README.md to prevent unwanted files getti…

…ng packaged

With README.md in the files array, the READMEs inside of docs/ and icons/ were being included in the
npm package.

package.json

@@ -10,7 +10,6 @@
     "src",
     "CHANGELOG.md",
     "CONTRIBUTING.md",
-    "README.md",
     "UPGRADING.md"
   ],
   "scripts": {