Bump to 0.1.8
diff --git a/Cargo.toml b/Cargo.toml
index ac33607..ffbe93f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "proc-macro2"
-version = "0.1.7"
+version = "0.1.8"
 authors = ["Alex Crichton <alex@alexcrichton.com>"]
 license = "MIT/Apache-2.0"
 readme = "README.md"