Add text/mdx with extension .mdx

closes jshttp#160

Author: silvenon

HISTORY.md

@@ -1,3 +1,8 @@
+unreleased
+==========
+
+  * Add `text/mdx` with extension `.mdx`
+
 1.39.0 / 2019-04-04
 ===================
 

db.json

@@ -7149,6 +7149,10 @@
     "source": "nginx",
     "extensions": ["mml"]
   },
+  "text/mdx": {
+    "compressible": true,
+    "extensions": ["mdx"]
+  },
   "text/mizar": {
     "source": "iana"
   },

src/custom-types.json

@@ -743,6 +743,14 @@
       "https://tools.ietf.org/html/rfc7763"
     ]
   },
+  "text/mdx": {
+    "compressible": true,
+    "extensions": ["mdx"],
+    "notes": "JSX in Markdown",
+    "sources": [
+      "https://github.com/mdx-js/specification"
+    ]
+  },
   "text/n3": {
     "compressible": true,
     "sources": [