fix(package): update joi to version 14.3.1

Closes #42

Author: greenkeeper[bot]

package.json

@@ -34,7 +34,7 @@
     "@types/sequelize": "4.27.31",
     "async": "2.6.1",
     "debug": "4.1.0",
-    "joi": "14.0.4",
+    "joi": "14.3.1",
     "lodash": "4.17.11",
     "semver": "5.6.0",
     "sequelize": "4.41.0"