fix(typescript): use esnext in lib (vuejs#2045)

ffxsam · yyx990803 · commit 5838096aa867 · 2018-08-05T22:10:38.000-04:00
diff --git a/packages/@vue/cli-plugin-typescript/generator/template/tsconfig.json b/packages/@vue/cli-plugin-typescript/generator/template/tsconfig.json
@@ -28,7 +28,7 @@
       ]
     },
     "lib": [
-      "es2015",
+      "esnext",
       "dom",
       "dom.iterable",
       "scripthost"
