fix(package): update semver to version 7.2.2

Closes #50

Author: greenkeeper[bot]

package.json

@@ -36,7 +36,7 @@
     "debug": "4.1.0",
     "joi": "14.0.4",
     "lodash": "4.17.11",
-    "semver": "5.6.0",
+    "semver": "7.2.2",
     "sequelize": "4.41.1"
   },
   "devDependencies": {