558260ec94
Removed excess '!' operation which caused the following error message,
```
Warning: Operand of null-aware operation '!' has type 'AngelWebSocket' which excludes null.
../…/lib/angel3_hot.dart:362
- 'AngelWebSocket' is from 'package:angel3_websocket/server.dart' ('../../../../../.pub-cache/hosted/pub.dartlang.org/angel3_websocket-4.1.2/lib/server.dart').
package:angel3_websocket/server.dart:1
var ws = _server!.app.container!.make<AngelWebSocket>()!;
```
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| angel3_hot.dart | ||