empty: support positive len

[ccoVeille]

this pattern is common

var arr []string
assert.True(t, 0 < len(arr))

https://github.com/search?q=language%3Ago+%22assert.True%28t%2C+0+%3C+len%28%22&type=code

compares checker will fix it to

var arr []string
assert.Positive(t, len(l))

But that's it, while we should convert it to Empty

assert.NotEmpty(t, l)

It's a new use case

Originally posted by @ccoVeille in #119 (comment)

[ccoVeille]

Please confirm if the logic is valid for you, then I can code it

[ccoVeille]

Well this one could be added to #119 maybe, not sure if we have to do it at the same time or separately

[Antonboom]

But this one won't be detected

Do you check it before spam issue?

Duplicate of #122
Implemented in #124

[ccoVeille]

I did check locally, but apparently I failed to find it.

I checked twice, once with testifylint binary, but I didn't build it recently 🤦

Sorry