0.9.0

Breaking changes:

• Changed type signature for all casting methods to use &str. This gives the
  crate a >10% increase in performance in a majority of conversions. Although
  most users only use:
  "my_string".to_camel_case()
  or
  "myString".to_string().to_snake_case()
  For those using the to_camel_case("something".to_string()) this will be a
  breaking change as the new syntax demands to_camel_case("something").