fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-LODASH-6139239

package.json

@@ -33,7 +33,7 @@
     "autocomplete-snippets": "https://www.atom.io/api/packages/autocomplete-snippets/versions/1.12.1/tarball",
     "autoflow": "file:packages/autoflow",
     "autosave": "https://www.atom.io/api/packages/autosave/versions/0.24.6/tarball",
-    "babel-core": "5.8.38",
+    "babel-core": "6.9.0",
     "background-tips": "https://www.atom.io/api/packages/background-tips/versions/0.28.0/tarball",
     "base16-tomorrow-dark-theme": "file:packages/base16-tomorrow-dark-theme",
     "base16-tomorrow-light-theme": "file:packages/base16-tomorrow-light-theme",