SIM113: Use enumerate

[MartinThoma]

Explanation

Use 'enumerate' to get a running number over an iterable.

Example

# Bad
idx = 0
for el in iterable:
    ...
    idx += 1

# Good
for idx, el in enumerate(iterable):
    ...

[MartinThoma]

This is a false-positive:

for x in xs:
    cm[x] += 1

[pablojadz]

This is another false possitive

results = []
next_ = 0
for i in range(10):
        if i % 2 == 0:
            continue

        results[next_] = i
        next_ += 1

[MartinThoma]

@pablojadz Could you please run pip install flake8-simplify --upgrade and test again? You should have flake8-simplify==0.14.1 and this issue should not exist anymore.