chore(deps): update dependency @babel/plugin-external-helpers to v7.7.4 (#708)

Author: renovate[bot]

package.json

@@ -37,7 +37,7 @@
   "devDependencies": {
     "@babel/cli": "7.7.4",
     "@babel/core": "7.7.4",
-    "@babel/plugin-external-helpers": "7.2.0",
+    "@babel/plugin-external-helpers": "7.7.4",
     "@babel/preset-env": "7.7.4",
     "@babel/preset-typescript": "7.7.4",
     "@types/jest": "24.0.23",

yarn.lock

@@ -327,10 +327,10 @@
   resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.7.4.tgz#75ab2d7110c2cf2fa949959afb05fa346d2231bb"
   integrity sha512-jIwvLO0zCL+O/LmEJQjWA75MQTWwx3c3u2JOTDK5D3/9egrWRRA0/0hk9XXywYnXZVVpzrBYeIQTmhwUaePI9g==
 
-"@babel/plugin-external-helpers@7.2.0":
-  version "7.2.0"
-  resolved "https://registry.yarnpkg.com/@babel/plugin-external-helpers/-/plugin-external-helpers-7.2.0.tgz#7f4cb7dee651cd380d2034847d914288467a6be4"
-  integrity sha512-QFmtcCShFkyAsNtdCM3lJPmRe1iB+vPZymlB4LnDIKEBj2yKQLQKtoxXxJ8ePT5fwMl4QGg303p4mB0UsSI2/g==
+"@babel/plugin-external-helpers@7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-external-helpers/-/plugin-external-helpers-7.7.4.tgz#8aa7aa402f0e2ecb924611cbf30942a497dfd17e"
+  integrity sha512-RVGNajLaFlknbZLutaP/uv7Q+xmVs2LMlEWFXbcjLnwtBdPqAVpV3nzYIAJqri/VjJCUrhG5nALijtg0aND+XA==
   dependencies:
     "@babel/helper-plugin-utils" "^7.0.0"