chore(package): update mysql package to support latest Amazon RDS certs

Author: mattzygowicz-NM

package-lock.json

@@ -42,7 +42,7 @@
     "@types/mysql": "^2.15.2",
     "@types/bluebird": "^3.5.26",
     "bluebird": "^3.5.1",
-    "mysql": "^2.17.1"
+    "mysql": "^2.18.1"
   },
   "devDependencies": {
     "proxyquire": "^2.0.1",