Remove deprecated jsnext option

Author: dgraham

rollup.config.bench.js

@@ -7,5 +7,5 @@ export default {
     file: 'build/bench.js',
     format: 'iife'
   },
-  plugins: [babel(), nodeResolve({jsnext: true})]
+  plugins: [babel(), nodeResolve()]
 };

rollup.config.test.js

@@ -7,5 +7,5 @@ export default {
     file: 'build/test.js',
     format: 'iife'
   },
-  plugins: [babel(), nodeResolve({jsnext: true})]
+  plugins: [babel(), nodeResolve()]
 };