docsrs-cfg 0.1.1

Quick use `doc_cfg` on docsrs
Documentation 
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Quick use `doc_cfg` on docsrs

```rust
use docsrs_cfg::docsrs_cfg;
#[docsrs_cfg(feature = "std")]
fn foo() {}
```

Expand to:

```rust
#[cfg(any(docsrs, feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
fn foo() {}
```