Turn off regex default features.

Author: PyroLagus

Cargo.toml

@@ -54,7 +54,7 @@ lazycell = "1"
 lazy_static = "1"
 peeking_take_while = "0.1.2"
 quote = { version = "1", default-features = false }
-regex = "1.0"
+regex = { version = "1.0", default-features = false , features = [ "std", "unicode"]}
 which = { version = "3.0", optional = true, default-features = false }
 shlex = "0.1"
 rustc-hash = "1.0.1"