Update packages

package.json

@@ -29,8 +29,8 @@
     "@babel/preset-react": "7.0.0",
     "@babel/preset-typescript": "7.3.3",
     "@emotion/core": "10.0.7",
-    "@mdx-js/mdx": "0.17.5",
-    "@mdx-js/tag": "0.17.0",
+    "@mdx-js/mdx": "0.20.1",
+    "@mdx-js/tag": "0.18.0",
     "@types/aws-lambda": "8.10.20",
     "@types/node": "10.12.29",
     "@types/react": "16.8.6",
@@ -39,7 +39,7 @@
     "babel-plugin-styled-components": "1.10.0",
     "colors.css": "3.0.0",
     "gatsby": "2.1.19",
-    "gatsby-mdx": "0.3.6",
+    "gatsby-mdx": "0.4.0",
     "gatsby-plugin-emotion": "4.0.4",
     "gatsby-plugin-feed": "2.0.14",
     "gatsby-plugin-netlify": "2.0.11",
@@ -56,7 +56,7 @@
     "mdx-utils": "0.0.2",
     "netlify-lambda": "1.4.2",
     "npm-run-all": "4.1.5",
-    "prism-react-renderer": "0.1.5",
+    "prism-react-renderer": "0.1.6",
     "prism-themes": "1.0.1",
     "prismjs": "1.15.0",
     "ramda": "0.26.1",