Move node-domexception declarations out of the src folder.

Author: octet-stream

node-domexception.d.ts

@@ -0,0 +1,7 @@
+declare module "node-domexception" {
+  class DOMException {
+    constructor(message: string, name: string)
+  }
+
+  export default DOMException
+}

src/node-domexception.d.ts

@@ -1,7 +1,5 @@
 {
-  "include": [
-    "src/**/*.ts"
-  ],
+  "include": ["src/**/*.ts", "node-domexception.d.ts"],
   "exclude": [
     "node_modules",
     "src/__helper__/**",