feat: Enable web sockets by default in Express template

Author: paveltiunov

packages/cubejs-cli/templates.js

@@ -21,6 +21,7 @@ const defaultDotEnvVars = env => `CUBEJS_DB_HOST=<YOUR_DB_HOST_HERE>
 CUBEJS_DB_NAME=<YOUR_DB_NAME_HERE>
 CUBEJS_DB_USER=<YOUR_DB_USER_HERE>
 CUBEJS_DB_PASS=<YOUR_DB_PASS_HERE>
+CUBEJS_WEB_SOCKETS=true
 ${sharedDotEnvVars(env)}`;
 
 const athenaDotEnvVars = env => `CUBEJS_AWS_KEY=<YOUR ATHENA AWS KEY HERE>