GNS3 2.2.3 release, network topology simulation tool

GNS3 2.2.3 has been released, as follows:

GUI:

• Fix the problem when bound to 0.0.0.0
• Double-cloud console configuration allows to open a session
• Support Python 3.8
• Set Requiments.txt in psutil to version 5.6.3

Server：

• The API returns an HTTP status code 204 when the project closed successfully 
• Support Python 3.8
• Still support Python> = 3.5.3 
• Repair exception of adding VirtualBox VM
• Set Requiments.txt in psutil to version 5.6.3
• The LimitNOFILE = 16384 Add to GNS3 Service
• The default udp port range is changed to 20000-30000

 See the release notes .