chore(package.json): change 'copy-files' script to copy README.md file into dist directory

Author: Bloodcast69

package.json

@@ -9,7 +9,7 @@
     "lint": "ng lint",
     "e2e": "ng e2e",
     "copy-scss": "cp -r projects/angular-bootstrap-md/src/lib/assets dist/angular-bootstrap-md/assets",
-    "copy-files": "cp projects/angular-bootstrap-md/src/lib/changelog projects/angular-bootstrap-md/src/lib/License.pdf dist/angular-bootstrap-md",
+    "copy-files": "cp projects/angular-bootstrap-md/src/lib/changelog projects/angular-bootstrap-md/src/lib/License.pdf README.md dist/angular-bootstrap-md",
     "pack-archive": "cd dist/angular-bootstrap-md && npm pack . && cp angular-bootstrap-md-8.*.tgz ../..",
     "remove-archive": "rm dist/angular-bootstrap-md/angular-bootstrap-md-8.*.tgz && cd ../..",
     "compile-lib": "ng build angular-bootstrap-md && npm run copy-scss && npm run copy-files && npm run pack-archive && npm run remove-archive",