Release v3.3.0 · ANLAB-KAIST/KENSv3

What's new in KENS v3.3

00a03e7: New echo assignment: learn to how to use POSIX network socket via implementing simple echo server and client.
6131eca : Solution versioning.
73c9d32, 524f15d, eeaccc9, dab20ab, 1ed7db9: Minor fixes in Dockerfile and entrypoint.sh.
6e2ef20: Drop Windows native support.
c273914 : Drop CentOS 8 support (EOL).
165e082, 5d9eb64, 87693a6: Automated WSL test.
af0654e, 1a0f616, 7b2abad, 69cf18b: Automated extra Linux distribution tests.