Merge pull request #72 from SuperMap/dependabot/npm_and_yarn/babel-plugin-istanbul-5.2.0

Bump babel-plugin-istanbul from 4.1.6 to 5.2.0

Author: songyumeng

package.json

@@ -58,7 +58,7 @@
     "babel-core": "^6.26.0",
     "babel-eslint": "^10.0.3",
     "babel-loader": "^7.1.4",
-    "babel-plugin-istanbul": "^4.1.6",
+    "babel-plugin-istanbul": "^5.2.0",
     "babel-preset-env": "^1.6.1",
     "babel-preset-es2015": "^6.24.1",
     "babelify": "^7.3.0",