Auto merge of rust-lang#1115 - emilio:bumpit, r=pepyakin

Minor version bump.

Only bugfixes have landed since the last release (rust-lang#1112 and rust-lang#1114), apart from
doc fixes.

Author: bors-servo

Cargo.lock

@@ -13,7 +13,7 @@ name = "bindgen"
 readme = "README.md"
 repository = "https://github.com/rust-lang-nursery/rust-bindgen"
 documentation = "https://docs.rs/bindgen"
-version = "0.31.0"
+version = "0.31.1"
 build = "build.rs"
 
 include = [