build(deps-dev): Bump @babel/types from 7.6.3 to 7.7.1

Bumps [@babel/types](https://github.com/babel/babel) from 7.6.3 to 7.7.1.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](babel/babel@v7.6.3...v7.7.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

packages/javascript-mutator/package.json

@@ -48,7 +48,7 @@
     "@stryker-mutator/core": "^2.0.0"
   },
   "devDependencies": {
-    "@babel/types": "~7.6.1",
+    "@babel/types": "~7.7.1",
     "@stryker-mutator/mutator-specification": "^2.1.0",
     "@stryker-mutator/test-helpers": "^2.1.0",
     "@types/babel__generator": "^7.0.0",