Bump Version

3.2.2 -> 4.0.0. Major version bump due to new build dependency.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "onig"
-version = "3.2.2"
+version = "4.0.0"
 authors = [
         "Will Speak <will@willspeak.me>",
         "Ivan Ivashchenko <defuz@me.com>"

README.md

@@ -15,7 +15,7 @@ Add the following to your `Cargo.toml` file:
 
 ```toml
 [dependencies]
-onig = "3.2"
+onig = "4.0"
 ```
 
 Add the following extern to your crate root:
@@ -73,9 +73,9 @@ The contents of this repository are distributed under the MIT license. See
 at our open [easy issues][easy_issues].
 
  [Onig_wiki]: https://en.wikipedia.org/wiki/Oniguruma
- [onig_crate_doc]: https://docs.rs/onig/3.2.2/onig/
+ [onig_crate_doc]: https://docs.rs/onig/4.0.0/onig/
  [examples_folder]: https://github.com/rust-onig/rust-onig/tree/master/examples
- [regex_new]: https://docs.rs/onig/3.2.2/onig/struct.Regex.html#method.new
- [regex_is_match]: https://docs.rs/onig/3.2.2/onig/struct.Regex.html#method.is_match
- [regex_find]: https://docs.rs/onig/3.2.2/onig/struct.Regex.html#method.find
+ [regex_new]: https://docs.rs/onig/4.0.0/onig/struct.Regex.html#method.new
+ [regex_is_match]: https://docs.rs/onig/4.0.0/onig/struct.Regex.html#method.is_match
+ [regex_find]: https://docs.rs/onig/4.0.0/onig/struct.Regex.html#method.find
  [easy_issues]: https://github.com/rust-onig/rust-onig/issues?q=is%3Aopen+is%3Aissue+label%3AE-Easy