move styled-jsx to peerDependencies in gatsby-plugin-styled-jsx

Author: zgreen

packages/gatsby-plugin-styled-jsx/README.md

@@ -4,7 +4,7 @@ Provides drop-in support for [styled-jsx](https://github.com/zeit/styled-jsx).
 
 ## Install
 
-`yarn add gatsby-plugin-styled-jsx`
+`yarn add styled-jsx gatsby-plugin-styled-jsx`
 
 ## How to use
 

packages/gatsby-plugin-styled-jsx/package.json

@@ -12,10 +12,12 @@
   "keywords": ["gatsby", "styled-jsx"],
   "license": "MIT",
   "dependencies": {
-    "babel-runtime": "^6.26.0",
-    "styled-jsx": "^2.2.1"
+    "babel-runtime": "^6.26.0"
   },
   "devDependencies": {
     "cross-env": "^5.0.5"
+  },
+  "peerDependencies": {
+    "styled-jsx": "^2.2.1"
   }
 }