Implement checkVersion middleware

Checks version on each request, terminating the application if version 
mdoes not match

src/app.ts

@@ -8,6 +8,7 @@ import session from "express-session";
 import pg from "pg";
 import pgSessionStore from "connect-pg-simple";
 import fetch, { Response as FetchResponse } from "node-fetch";
+import { log, LogLevel } from "./logging"
 import cron from "./cron";
 import db from "./db";
 import errorHandler from "./errors";
@@ -26,6 +27,7 @@ async function validateApiToken(session: Express.Session) {
 }
 
 const app = express();
+app.use(version.checkVersionMiddleware);
 app.use(express.static('public'));
 app.use(express.urlencoded({extended: false}));
 app.use(session({
@@ -340,4 +342,8 @@ version.checkVersion().then(_ => app.listen(config.port, () => {
 	cron.run();
 	setInterval(cron.run,config.cronInterval);
   console.log(`Listening on port ${config.port}`);
-}));
+}))
+.catch((e) => {
+	log(LogLevel.ERROR,e)
+	process.exit(1);
+});