`ts-framework run` fails if the port is in use

[rangelfinal]

Example:

core-workers_1  | info: Successfully started server in Workers mode, will not listen to any requests
core-workers_1  | error: listen EADDRINUSE: address already in use :::3000 {
core-workers_1  |   "stack": "Error: listen EADDRINUSE: address already in use :::3000\n    at Server.setupListenHandle [as _listen2] (net.js:1259:14)\n    at listenInCluster (net.js:1307:12)\n    at Server.listen (net.js:1395:7)\n    at Function.listen (/usr/src/bitcapital/node_modules/express/lib/application.js:618:24)\n    at Promise (/usr/src/bitcapital/node_modules/ts-framework/lib/server/index.ts:83:10)\n    at new Promise (<anonymous>)\n    at WorkersServer.<anonymous> (/usr/src/bitcapital/node_modules/ts-framework/lib/server/index.ts:80:12)\n    at Generator.next (<anonymous>)\n    at fulfilled (/usr/src/bitcapital/node_modules/ts-framework/dist/server/index.js:4:58)\n    at processTicksAndRejections (internal/process/task_queues.js:86:5)",
core-workers_1  |   "code": "EADDRINUSE",
core-workers_1  |   "errno": "EADDRINUSE",
core-workers_1  |   "syscall": "listen",
core-workers_1  |   "address": "::",
core-workers_1  |   "port": 3000
core-workers_1  | }