Bump to 0.2.3
diff --git a/src/lib.rs b/src/lib.rs
index 31ba765..d49af0c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -24,7 +24,7 @@
 //! [ts]: https://doc.rust-lang.org/proc_macro/struct.TokenStream.html
 
 // Proc-macro2 types in rustdoc of other crates get linked to here.
-#![doc(html_root_url = "https://docs.rs/proc-macro2/0.2.2")]
+#![doc(html_root_url = "https://docs.rs/proc-macro2/0.2.3")]
 
 #![cfg_attr(feature = "nightly", feature(proc_macro))]