chore(package): update mysql2 to version 1.6.2

Author: greenkeeper[bot]

package.json

@@ -56,7 +56,7 @@
     "mocha": "5.2.0",
     "mocha-lcov-reporter": "1.3.0",
     "mocha-performance": "0.1.1",
-    "mysql2": "1.6.0",
+    "mysql2": "1.6.2",
     "nyc": "^12.0.1",
     "pg": "7.6.0",
     "pg-hstore": "2.3.2",