Websockets not suported in Windows 7 

### Description

When Enigma trys to connect to qlik it creates a ClientWebSocket. this throws a PlatformNotSuportedException under Win 7


##### Operating system
```
[X] Windows 7
[ ] OSX
[ ] Linux
```

##### .net Framework system
```
[ ] .net core
[X] .net 452
```

### Versions
* Version of enigma.net: 1.0.0
