update the install blurb

Author: bahmutov

README.md

@@ -34,13 +34,18 @@ npm i -D cypress-grep
 yarn add -D cypress-grep
 ```
 
-**required:** load this module from the [support file](https://on.cypress.io/writing-and-organizing-tests#Support-file) or at the top of the spec file if not using the support file.
+**required:** load this module from the [support file](https://on.cypress.io/writing-and-organizing-tests#Support-file) or at the top of the spec file if not using the support file. You improve the registration function and then call it:
 
 ```js
 // cypress/support/index.js
-// load and register the grep feature
+// load and register the grep feature using "require" function
 // https://github.com/cypress-io/cypress-grep
-require('cypress-grep')()
+const registerCypressGrep = require('cypress-grep')
+registerCypressGrep()
+
+// if you want to use the "import" keyword
+import registerCypressGrep from 'cypress-grep'
+registerCypressGrep()
 ```
 
 ### Plugin file