Bump cross-env from 6.0.3 to 7.0.2

Bumps [cross-env](https://github.com/kentcdodds/cross-env) from 6.0.3 to 7.0.2.
- [Release notes](https://github.com/kentcdodds/cross-env/releases)
- [Changelog](https://github.com/kentcdodds/cross-env/blob/master/CHANGELOG.md)
- [Commits](kentcdodds/cross-env@v6.0.3...v7.0.2)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

npm-shrinkwrap.json

@@ -119,7 +119,7 @@
 	"devDependencies": {
 		"ava": "^2.4.0",
 		"coveralls": "^3.0.9",
-		"cross-env": "^6.0.3",
+		"cross-env": "^7.0.2",
 		"docdash": "^1.2.0",
 		"eslint": "^6.8.0",
 		"eslint-config-google": "^0.14.0",