Add contains instance method for strings
#449
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I currently use a dirty hack to achieve the functionality of `contains`
method:
```rust
fn contains(s, sub) {
s.len() != s.replace(sub, "").len()
}
```
It would be nice if Rune just supports `.contains` IMHO.
Signed-off-by: Gaoyang Zhang <gy@blurgy.xyz>
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I currently use a dirty hack to achieve the functionality of
containsmethod:It would be nice if Rune just supports
.containsIMHO.