Allow to access routes via trailing slash

[endel]

When using app.get("/users/xx"), both URLs should be accessible:

• /users/xx
• /users/xx/

[endel]

Just published uwebsockets-express@1.2.0 with these changes https://github.com/colyseus/uWebSockets-express/pull/13 (now the built-in express router is being used rather than being mocked/mimicked)