docs(readme): mention test:update and test:update:warn npm scripts

README.md

@@ -104,9 +104,21 @@ npm run test:warn
 ```
 
 Coverage report is located in `tests/coverage`.
-you might want to review it in your browser, and for example,
+You might want to review it in your browser, and for example,
 write tests for non-covered blocks, or remove them if they're useless.
 
+To run tests and update snapshots:
+
+```sh
+npm run test:update
+```
+
+or (with rollup warnings):
+
+```sh
+npm run test:update:warn
+```
+
 ### Commiting changes
 
 Please follow the [conventional commits][5] specification, because [semantic-release][6] is used to automate the whole package release workflow including: determining the next version number, generating the release notes and publishing the package.