Upgrade babel

package.json

@@ -34,11 +34,11 @@
   "private": true,
   "homepage": "https://threema.ch/",
   "dependencies": {
-    "@babel/core": "^7.4.5",
-    "@babel/plugin-syntax-dynamic-import": "^7.2.0",
-    "@babel/plugin-transform-runtime": "^7.4.4",
-    "@babel/preset-env": "^7.4.5",
-    "@babel/runtime": "^7.4.5",
+    "@babel/core": "^7.8.4",
+    "@babel/plugin-syntax-dynamic-import": "^7.8.3",
+    "@babel/plugin-transform-runtime": "^7.8.3",
+    "@babel/preset-env": "^7.8.4",
+    "@babel/runtime": "^7.8.4",
     "@saltyrtc/client": "^0.14.4",
     "@saltyrtc/task-relayed-data": "^0.3.1",
     "@saltyrtc/task-webrtc": "^0.14.1",