Disable the unicode feature from regex

I don't see any way this feature could be useful for modules and it
brings in a lot of code.

Author: Eijebong

Cargo.toml

@@ -21,7 +21,7 @@ members = [
 
 [dependencies]
 log = { version = "0.4.8", features = ["std"] }
-regex = { version = "1.0.3", optional = true }
+regex = { version = "1.0.3", optional = true, default-features=false, features=["std", "perf"] }
 termcolor = { version = "1.0.2", optional = true }
 humantime = { version = "2.0.0", optional = true }
 atty = { version = "0.2.5", optional = true }