chore(deps): update babel monorepo to v7.7.4 (#584)

Author: renovate[bot]

package.json

@@ -32,11 +32,11 @@
     "typecheck": "tsc --noEmit"
   },
   "devDependencies": {
-    "@babel/cli": "7.7.0",
-    "@babel/core": "7.7.2",
-    "@babel/plugin-external-helpers": "7.2.0",
-    "@babel/preset-env": "7.7.1",
-    "@babel/preset-typescript": "7.7.2",
+    "@babel/cli": "7.7.4",
+    "@babel/core": "7.7.4",
+    "@babel/plugin-external-helpers": "7.7.4",
+    "@babel/preset-env": "7.7.4",
+    "@babel/preset-typescript": "7.7.4",
     "babel-plugin-add-module-exports": "1.0.2",
     "babel-plugin-dev-expression": "0.2.2",
     "concurrently": "5.0.0",