Upgrade dependency to support NodeJS 12+

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "xmysql",
-  "version": "0.4.9",
+  "version": "0.5.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -877,9 +877,9 @@
       }
     },
     "nan": {
-      "version": "2.11.0",
-      "resolved": "https://registry.npmjs.org/nan/-/nan-2.11.0.tgz",
-      "integrity": "sha512-F4miItu2rGnV2ySkXOQoA8FKz/SR2Q2sWP0sbTxNxz/tuokeC8WxOhPMcwi0qIyGtVn/rrSeLbvVkznqCdwYnw==",
+      "version": "2.14.0",
+      "resolved": "https://registry.npmjs.org/nan/-/nan-2.14.0.tgz",
+      "integrity": "sha512-INOFj37C7k3AfaNTtX8RhsTw7qRy7eLET14cROi9+5HAVbbHuIWUHEauBv5qT4Av2tWasiTY1Jw6puUNqRJXQg==",
       "dev": true
     },
     "negotiator": {
@@ -1231,12 +1231,12 @@
       "dev": true
     },
     "sleep": {
-      "version": "5.2.3",
-      "resolved": "https://registry.npmjs.org/sleep/-/sleep-5.2.3.tgz",
-      "integrity": "sha512-vC05N1XqgIiPIj6tEq7wt0R32aTycJv4Ymo/jwSEp2PkeU1GCJ1tkl+RdYZEo7Gjebq8QQuhFuEe7vsyVGlFRA==",
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/sleep/-/sleep-6.1.0.tgz",
+      "integrity": "sha512-Z1x4JjJxsru75Tqn8F4tnOFeEu3HjtITTsumYUiuz54sGKdISgLCek9AUlXlVVrkhltRFhNUsJDJE76SFHTDIQ==",
       "dev": true,
       "requires": {
-        "nan": ">=2.5.1"
+        "nan": "^2.13.2"
       }
     },
     "spdx-correct": {

package.json

@@ -42,7 +42,7 @@
     "eslint-plugin-prettier": "^3.0.1",
     "mocha": "^5.2.0",
     "should": "^13.1.2",
-    "sleep": "^5.1.1",
+    "sleep": "^6.1.0",
     "supertest": "^3.0.0"
   }
 }