bump dep on regex-syntax to 0.2.4
bump dep on regex-syntax to 0.2.4

golddranks/regex,SeanRBurton/regex,rust-lang/regex,golddranks/regex,SeanRBurton/regex,SeanRBurton/regex,rust-lang/regex,rust-lang/regex,SeanRBurton/regex,rust-lang-nursery/regex,SeanRBurton/regex,golddranks/regex,rust-lang-nursery/regex,rust-lang/regex,rust-lang/regex,rust-lang-nursery/regex,rust-lang-nursery/regex,rust-lang-nursery/regex