Update mozjs_sys dependency

Alan Jeffrey · Alan Jeffrey · commit 399009c2c213 · 2018-05-29T15:33:37.000-05:00
diff --git a/Cargo.toml b/Cargo.toml
@@ -47,4 +47,4 @@ lazy_static = "1"
 libc = "0.2"
 log = "0.4"
 num-traits = "0.1.32"
-mozjs_sys = "0.51"
+mozjs_sys = "0.51.1"
