Adds typedefs for pure (#1516)

* Adds typedefs for pure
* chore: add new line

Author: chriserickson

package.json

@@ -29,6 +29,7 @@
     "jest-preset/",
     "typings/index.flow.js",
     "pure.js",
+    "pure.d.ts",
     "dont-cleanup-after-each.js"
   ],
   "devDependencies": {

pure.d.ts

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