Bump the versions to propagate servo/mozjs#132

Author: marmistrz

Cargo.toml

@@ -2,7 +2,7 @@
 name = "mozjs"
 description = "Rust bindings to the Mozilla SpiderMonkey JavaScript engine."
 repository = "https://github.com/servo/rust-mozjs"
-version = "0.1.12"
+version = "0.1.13"
 authors = ["The Servo Project Developers"]
 build = "build.rs"
 license = "MPL-2.0"
@@ -47,4 +47,4 @@ lazy_static = "1"
 libc = "0.2"
 log = "0.4"
 num-traits = "0.1.32"
-mozjs_sys = "0.50.0"
+mozjs_sys = "0.50.1"