deps: update to latest regex crate

The regex update fixes the Rust nightly build failure by in turn updating its simd dependency to 2.x. The regex update also includes a literal optimization that uses Tuned Boyer Moore. Fixes #617
BurntSushi · Dec 30, 2017 · 7dd1194 · 7dd1194
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commit 7dd1194
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diff --git a/Cargo.lock b/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
@@ -46,7 +46,7 @@ log = "0.3"
 memchr = "2"
 memmap = "0.6"
 num_cpus = "1"
-regex = "0.2.1"
+regex = "0.2.4"
 same-file = "1"
 termcolor = { version = "0.3.3", path = "termcolor" }