Changelog

• e1ff2e4 Update module github.com/pion/dtls/v2 to v2.2.7
• 88ce995 Update CI configs to v0.10.9
• 64f9629 Bring back LICENSE file
• 85c2ee5 Update module github.com/stretchr/testify to v1.8.3
• ec60b82 Update CI configs to v0.10.8
• 66883f6 Use log package instead of fmt for logging
• fa782fa Use voipgate STUN server as default
• f923095 Replace blackberry STUN server by Voipgate's one