Bump semver from 5.5.0 to 5.6.0

Bumps [semver](https://github.com/npm/node-semver) from 5.5.0 to 5.6.0.
- [Release notes](https://github.com/npm/node-semver/releases)
- [Commits](npm/node-semver@v5.5.0...v5.6.0)

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

Author: dependabot-support

package-lock.json

@@ -106,7 +106,7 @@
 		"pretty-data": "^0.40.0",
 		"pretty-hrtime": "^1.0.3",
 		"replacestream": "^4.0.3",
-		"semver": "^5.5.0",
+		"semver": "^5.6.0",
 		"uglify-es": "^3.2.2",
 		"xml2js": "^0.4.17"
 	},