fix(package): update semver to version 6.1.1

Closes #96

Author: greenkeeper[bot]

package.json

@@ -30,7 +30,7 @@
     "generator-gadget": "^1.2",
     "generator-pattern-lab-starter": "git+https://[email protected]/phase2/generator-pattern-lab-starter.git#a626d763d9619228de3ea56c1ee9b804ff7ef131",
     "lodash": "^4.17.4",
-    "semver": "^5.3.0",
+    "semver": "^6.1.1",
     "yeoman-generator": "^1.1.0",
     "yosay": "^2.0.0"
   },