Remove fixed IV example, may be mistakenly perpetuated by beginners

[silviuk]

kms-demo/main.py

Line 35 in 8547db6

obj = AES.new(keyPlain, AES.MODE_CBC, b'This is an IV123')

[silviuk]

The other one with random IV below is preferable. In fact, one might want to totally take away IV generation from user's hands in such high-level crypto APIs...

kms-demo/main.py

Line 108 in 8547db6

iv = Random.new().read(AES.block_size)

[sebsto]

Fixed with 9e11cfe

Thank you