Upgrade to babel 7

.babelrc.diff

$ git diff .babelrc
diff --git a/.babelrc b/.babelrc
index 53b35ab..15eefa0 100644
--- a/.babelrc
+++ b/.babelrc
@@ -1,16 +1,16 @@
 {
   "plugins": [
     "source-map-support",
-    "transform-runtime"
+    "@babel/plugin-transform-runtime",
+    "@babel/plugin-syntax-dynamic-import"
   ],
   "presets": [
-    [ "env", { "node": "8.10" } ],
-    "stage-3"
+    [ "@babel/preset-env", { "node": "8.10" } ]
   ],
   "env": {
     "test": {
       "presets": [
-        [ "env", { "targets": { "node": "8.10" } } ]
+        [ "@babel/preset-env", { "targets": { "node": "8.10" } } ]
       ]
     }
   }