fix: tweak CONTRIBUTING based on more experience
MODIFY
CONTRIBUTING.md
CONTRIBUTING.md
# if it does not show you logged in, then do
$ npm login
# two factor authentication stuff
+ $ npm publish
```
* Go to the npm web page for the package, for example
[https://www.npmjs.com/package/ses](https://www.npmjs.com/package/ses).
Do not squash.
Rebasing or squashing will remove the tag from the history of the `master`
branch.
+
+* Selecting "Create a merge commit" in that drop down is sticky. Assuming you
+ normally want "Squash and merge", be sure to set it back to that at your
+ next opportunity.

fix: tweak CONTRIBUTING based on more experience (#658)