docs: update NPM upgrade instructions

Author: Blackjacx

README.md

@@ -65,11 +65,11 @@ To release the backlog notifier do the following:
   ```shell
   npm outdated
   ```
-  2. Update everything (respects semver ranges)
+  2. Update all the packages listed to the latest version (specified by the \fBtag\fR config ⟨/using-npm/config#tag⟩), respecting the semver constraints of both your package and its dependencies (if they also require the same package).
   ```shell
-  npm update
+  npm update --save
   ```
-  3. Update package.json to latest versions
+  3. Update package.json to latest versions (🚨 skip this since it does not seem to respect semver constraints)
   ```shell
   npx npm-check-updates -u
   ```