Release v4.x

What's Changed

• NTN Module Integration in #17
• Upgrade to ns-3.42

More information on this release are available through the following research publication:

• G. Grieco, G. Iacovelli, M. Sandri, M. Giordani, M. Zorzi and L. A. Grieco, "Preliminary Performance Evaluation of a Satellite-to-HAP Communication Link," European Wireless 2023; 28th European Wireless Conference, Rome, Italy, 2023, pp. 340-345.