Add 3.1.0.d.ts file

Author: flaksp

package.json

@@ -2,7 +2,6 @@
   "name": "@fosfad/openapi-typescript-definitions",
   "description": "Types and interfaces for writing valid OpenAPI specification in TypeScript.",
   "repository": "github:fosfad/openapi-typescript-definitions",
-  "types": "index.d.ts",
   "files": [
     "**/*.d.ts"
   ],

src/3.1.0.d.ts

@@ -0,0 +1 @@
+export * from './3.1.0';