make global this correct when using rollup

JakeChampion · JakeChampion · commit 6e9fc0ee026d · 2020-07-09T16:38:18.000+01:00
diff --git a/rollup.config.js b/rollup.config.js
@@ -5,5 +5,6 @@ export default {
     format: 'umd',
     name: 'WHATWGFetch',
     strict: false
-  }
+  },
+  context: 'this'
 }
