feat: add typescript definition

index.d.ts

@@ -0,0 +1 @@
+export default function getUserAgentNode(): string;

package.json

@@ -2,8 +2,13 @@
   "name": "universal-user-agent",
   "version": "0.0.0-development",
   "description": "Get a user agent string in both browser and node",
+  "repository": "https://github.com/gr2m/universal-user-agent.git",
+  "keywords": [],
+  "author": "Gregor Martynus (https://github.com/gr2m)",
+  "license": "ISC",
   "main": "index.js",
   "browser": "browser.js",
+  "types": "index.d.ts",
   "scripts": {
     "coverage": "nyc report --reporter=html && open coverage/index.html",
     "coverage:upload": "nyc report --reporter=text-lcov | coveralls",
@@ -13,9 +18,6 @@
     "semantic-release": "semantic-release",
     "travis-deploy-once": "travis-deploy-once"
   },
-  "keywords": [],
-  "author": "Gregor Martynus (https://github.com/gr2m)",
-  "license": "ISC",
   "devDependencies": {
     "chai": "^4.1.2",
     "coveralls": "^3.0.2",
@@ -41,9 +43,5 @@
       "afterEach",
       "expect"
     ]
-  },
-  "repository": {
-    "type": "git",
-    "url": "https://github.com/gr2m/universal-user-agent.git"
   }
 }