404 link to hyperscan in ripgrep

[zpar-ky]

Line ~1245: [I adapted the algorithm from the Hyperscan project to Rust](https://github.com/rust-lang-nursery/regex/blob/master/src/simd_accel/teddy128.rs), and included an extensive write up in the comments if you're interested. Current: https://github.com/rust-lang/regex/blob/master/src/literal/teddy_ssse3/imp.rs Or as found earlier in the post: https://github.com/rust-lang-nursery/regex/blob/3de8c44f5357d5b582a80b7282480e38e8b7d50d/src/simd_accel/teddy128.rs

[BurntSushi]

Aye, thanks! The URL is actually going to change once more, so I'll update this when that happens.