Update all dependencies

Author: renovate-bot

backend/package.json

@@ -14,12 +14,12 @@
     "graphql-yoga": "^1.17.4"
   },
   "devDependencies": {
-    "@babel/cli": "7.6.4",
-    "@babel/core": "7.6.4",
-    "@babel/node": "7.6.3",
-    "@babel/plugin-proposal-class-properties": "7.5.5",
-    "@babel/plugin-proposal-object-rest-spread": "7.6.2",
-    "@babel/plugin-transform-arrow-functions": "7.2.0",
-    "@babel/preset-env": "7.6.3"
+    "@babel/cli": "7.7.4",
+    "@babel/core": "7.7.4",
+    "@babel/node": "7.7.4",
+    "@babel/plugin-proposal-class-properties": "7.7.4",
+    "@babel/plugin-proposal-object-rest-spread": "7.7.4",
+    "@babel/plugin-transform-arrow-functions": "7.7.4",
+    "@babel/preset-env": "7.7.4"
   }
 }