Use module over webpack to be a little bit more tool agnostic

Author: weswigham

package.json

@@ -28,7 +28,7 @@
     "sideEffects": false,
     "exports": {
         ".": {
-            "webpack": "./tslib.es6.js",
+            "module": "./tslib.es6.js",
             "import": "./modules/index.js",
             "default": "./tslib.js"
         },