update gatsby dependecies

packages/learn/gatsby-config.js

@@ -13,7 +13,7 @@ module.exports = {
     url: 'http://localhost:3000'
   },
   plugins: [
-    'gatsby-plugin-react-next',
+    'gatsby-plugin-layout',
     'gatsby-plugin-react-helmet',
     {
       resolve: 'fcc-source-challenges',

packages/learn/package.json

@@ -19,27 +19,26 @@
     "debug": "^3.1.0",
     "dotenv": "^5.0.1",
     "enzyme": "^3.3.0",
-    "enzyme-adapter-react-15": "^1.0.5",
+    "enzyme-adapter-react-16": "^1.5.0",
     "fetchr": "^0.5.37",
-    "gatsby": "^1.9.243",
-    "gatsby-link": "^1.6.39",
+    "gatsby": "next",
     "gatsby-plugin-google-fonts": "^0.0.4",
-    "gatsby-plugin-react-helmet": "^2.0.8",
-    "gatsby-plugin-react-next": "^1.0.11",
-    "gatsby-plugin-sitemap": "^1.2.21",
-    "gatsby-remark-prismjs": "^2.0.2",
-    "gatsby-source-filesystem": "^1.5.29",
-    "gatsby-source-mongodb": "^1.5.19",
-    "gatsby-transformer-json": "^1.0.16",
-    "gatsby-transformer-remark": "^1.7.39",
+    "gatsby-plugin-layout": "next",
+    "gatsby-plugin-react-helmet": "next",
+    "gatsby-plugin-sitemap": "next",
+    "gatsby-remark-prismjs": "next",
+    "gatsby-source-filesystem": "next",
+    "gatsby-source-mongodb": "next",
+    "gatsby-transformer-json": "next",
+    "gatsby-transformer-remark": "next",
     "jest": "^22.4.3",
     "lodash": "^4.17.5",
     "loop-protect": "^2.1.6",
     "mongodb": "^3.0.5",
-    "prismjs": "^1.14.0",
-    "react": "16",
+    "prismjs": "^1.15.0",
+    "react": "^16.4.0-0",
     "react-bootstrap": "^0.32.1",
-    "react-dom": "16",
+    "react-dom": "^16.4.0-0",
     "react-freecodecamp-search": "^2.0.2",
     "react-ga": "^2.5.2",
     "react-helmet": "^5.2.0",
@@ -97,7 +96,6 @@
     "babel-eslint": "^8.2.2",
     "babel-plugin-transform-es2015-arrow-functions": "^6.22.0",
     "babel-plugin-transform-function-bind": "^6.22.0",
-    "enzyme-adapter-react-16": "^1.1.1",
     "eslint": "^4.19.1",
     "eslint-config-freecodecamp": "^1.1.1",
     "eslint-plugin-import": "^2.9.0",