chore(gatsby-plugin-no-sourcemaps): Add install header to Read… (#20544)

Added an install heading to instruct users to install the plugin.
gatsbyjs · Jan 13, 2020 · a78cebc · a78cebc
1 parent accaed1
commit a78cebc
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diff --git a/packages/gatsby-plugin-no-sourcemaps/README.md b/packages/gatsby-plugin-no-sourcemaps/README.md
@@ -2,6 +2,12 @@
 
 For the times when your JavaScript sourcemaps are just too big to upload to your hosting provider.
 
+## Install
+
+```shell
+npm install --save gatsby-plugin-no-sourcemaps
+```
+
 ## Usage
 
 ```js