docs: add @testing-library/dom to installation (#337)

This is required as a peer dependency, which wasn't obvious from the readme.
testing-library · Jun 10, 2020 · 4356cc5 · 4356cc5
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commit 4356cc5
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/README.md b/README.md
@@ -75,13 +75,13 @@ change the state of the checkbox.
 With NPM:
 
 ```sh
-npm install @testing-library/user-event --save-dev
+npm install @testing-library/user-event @testing-library/dom --save-dev
 ```
 
 With Yarn:
 
 ```sh
-yarn add @testing-library/user-event --dev
+yarn add @testing-library/user-event @testing-library/dom --dev
 ```
 
 Now simply import it in your tests: