use latest node version and catch unhandledRejections

package.json

@@ -42,7 +42,7 @@
     "test": "jasmine-ts --config=jasmine.json"
   },
   "engines": {
-    "node": "14.x"
+    "node": "16.x"
   },
   "resolutions": {
     "bn.js": "5.1.3",

src/index.ts

@@ -439,3 +439,7 @@ app.get('/trades/address/:marketPk', async (req, res) => {
 
 const httpPort = parseInt(process.env.PORT || '5000')
 app.listen(httpPort)
+
+process.on('unhandledRejection', (err: any, p: any) => {
+  console.error(`Unhandled rejection: ${err} promise: ${p})`)
+})