Bump babel-plugin-istanbul from 5.1.4 to 5.2.0

Bumps [babel-plugin-istanbul](https://github.com/istanbuljs/babel-plugin-istanbul) from 5.1.4 to 5.2.0.
- [Release notes](https://github.com/istanbuljs/babel-plugin-istanbul/releases)
- [Changelog](https://github.com/istanbuljs/babel-plugin-istanbul/blob/master/CHANGELOG.md)
- [Commits](https://github.com/istanbuljs/babel-plugin-istanbul/compare/v5.1.4...v5.2.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

yarn.lock

@@ -1341,10 +1341,11 @@ babel-plugin-dynamic-import-node@^2.3.0:
     object.assign "^4.1.0"
 
 babel-plugin-istanbul@^5.1.0:
-  version "5.1.4"
-  resolved "https://registry.yarnpkg.com/babel-plugin-istanbul/-/babel-plugin-istanbul-5.1.4.tgz#841d16b9a58eeb407a0ddce622ba02fe87a752ba"
-  integrity sha512-dySz4VJMH+dpndj0wjJ8JPs/7i1TdSPb1nRrn56/92pKOF9VKC1FMFJmMXjzlGGusnCAqujP6PBCiKq0sVA+YQ==
+  version "5.2.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-istanbul/-/babel-plugin-istanbul-5.2.0.tgz#df4ade83d897a92df069c4d9a25cf2671293c854"
+  integrity sha512-5LphC0USA8t4i1zCtjbbNb6jJj/9+X6P37Qfirc/70EQ34xKlMW+a1RHGwxGI+SwWpNwZ27HqvzAobeqaXwiZw==
   dependencies:
+    "@babel/helper-plugin-utils" "^7.0.0"
     find-up "^3.0.0"
     istanbul-lib-instrument "^3.3.0"
     test-exclude "^5.2.3"