Add npm login and verification steps

Author: consideRatio

RELEASE.md

@@ -44,18 +44,25 @@ meet the prerequisites:
    # bump2version --no-commit minor
    # bump2version --no-commit major
    bump2version --tag release
+
+   # verify changes
+   git diff HEAD~1
    ```
 
 1. Publish to NPM.
 
    ```bash
+   npm login
    npm publish
    ```
 
 1. Reset the version to the next development version with `bump2version`.
 
    ```bash
    bump2version --no-tag patch
+
+   # verify changes
+   git diff HEAD~1
    ```
 
 1. Push your release related commits to master along with the annotated tags