DOC: update contribution docs for npm

CONTRIBUTING.md

@@ -84,9 +84,12 @@ To publish a new version on npm:
     # Merge into dev branch
     git checkout master
     git merge dev
-    git tag -a v0.x.x           # Add a one-line summary
+    git tag -a v0.x.x -m"Add a one-line summary"
     git push --follow-tags
-    npm publish               # as sanand0
+
+    # Publish to https://www.npmjs/package/g1
+    # Maintained currently by @sanand0
+    npm publish
 
     git checkout dev