Merge branch 'prism-options' of https://github.com/system-ui/theme-ui into prism-options

Author: Laurie Barth

packages/gatsby-plugin-theme-ui/package.json

@@ -7,7 +7,6 @@
   "peerDependencies": {
     "gatsby": "^2.13.1",
     "theme-ui": "^0.3.0",
-    "@theme-ui/prism": "0.3.0",
     "gatsby-core-utils": "^1.2.0"
   },
   "keywords": [