update all packages to latest version

package.json

@@ -5,31 +5,31 @@
   "version": "0.1.0",
   "author": "Nathan Wang <nathan.r.wang@gmail.com>",
   "dependencies": {
-    "@mdx-js/mdx": "^1.6.5",
-    "@mdx-js/react": "^1.6.5",
+    "@mdx-js/mdx": "^1.6.6",
+    "@mdx-js/react": "^1.6.6",
     "@tailwindcss/ui": "^0.3.0",
     "esm": "^3.2.25",
-    "gatsby": "^2.22.15",
+    "gatsby": "^2.23.7",
     "gatsby-image": "^2.4.7",
-    "gatsby-plugin-manifest": "^2.4.9",
-    "gatsby-plugin-mdx": "^1.2.15",
-    "gatsby-plugin-offline": "^3.2.7",
-    "gatsby-plugin-postcss": "^2.3.3",
+    "gatsby-plugin-manifest": "^2.4.12",
+    "gatsby-plugin-mdx": "^1.2.16",
+    "gatsby-plugin-offline": "^3.2.11",
+    "gatsby-plugin-postcss": "^2.3.4",
     "gatsby-plugin-react-helmet": "^3.3.4",
     "gatsby-plugin-sharp": "^2.6.12",
-    "gatsby-remark-autolink-headers": "^2.3.4",
-    "gatsby-remark-custom-blocks": "^2.3.3",
-    "gatsby-remark-katex": "^3.3.3",
+    "gatsby-remark-autolink-headers": "^2.3.5",
+    "gatsby-remark-custom-blocks": "^2.3.4",
+    "gatsby-remark-katex": "^3.3.4",
     "gatsby-remark-prismjs": "^3.5.4",
     "gatsby-source-filesystem": "^2.3.12",
-    "gatsby-transformer-remark": "^2.8.14",
-    "gatsby-transformer-sharp": "^2.5.3",
+    "gatsby-transformer-remark": "^2.8.17",
+    "gatsby-transformer-sharp": "^2.5.5",
     "katex": "^0.11.1",
     "prismjs": "^1.20.0",
     "prop-types": "^15.7.2",
-    "react": "^16.12.0",
-    "react-dom": "^16.12.0",
-    "react-helmet": "^6.0.0",
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1",
+    "react-helmet": "^6.1.0",
     "react-transition-group": "^4.4.1",
     "rehype-react": "^6.0.0",
     "remark": "^12.0.0",