README.md: update usage instructions [skip ci]

dashed · Sep 21, 2017 · f88556d · f88556d
1 parent 3ebecf9
commit f88556d
Showing 1 changed file with 5 additions and 2 deletions.
diff --git a/README.md b/README.md
@@ -18,9 +18,12 @@ The `customizer` is bound to `thisArg` and invoked with three arguments: `(value
 
 ## Usage
 
-```
-$ npm install --save shallowequal
+```sh
 $ yarn add shallowequal
+# npm v5+
+$ npm install shallowequal
+# before npm v5
+$ npm install --save shallowequal
 ```
 
 ```js