SIM104 proposes yield from under async generators

[ergoithz]

Desired change

• Rule(s): SIM104
• Adjustment: do not propose yield from on async generators.

Explanation

Yield-from is strictly forbidden under async generators, it looks like flake8-simplify does not check if generator is async before proposing that change.

Example

async def items():
    for c in 'abc':
        yield c