Added chance-generators to the install command

sunesimonsen · sunesimonsen · commit 5f2767574234 · 2018-08-11T17:53:39.000+02:00
diff --git a/documentation/index.md b/documentation/index.md
@@ -35,7 +35,7 @@ therefore provide much more precise error cases.
 Install it with NPM or add it to your `package.json`:
 
 ```
-$ npm install --save-dev unexpected unexpected-check
+$ npm install --save-dev unexpected unexpected-check chance-generators
 ```
 
 Then register the plugin:
