Update bindgen and bump version

Let's kill regex 0.2 !

Author: Eijebong

Cargo.toml

@@ -2,7 +2,7 @@
 name = "mozjs_sys"
 description = "System crate for the Mozilla SpiderMonkey JavaScript engine."
 repository = "https://github.com/servo/mozjs/"
-version = "0.51.3"
+version = "0.51.4"
 authors = ["Mozilla"]
 links = "mozjs"
 build = "build.rs"
@@ -27,5 +27,5 @@ libc = "0.2"
 libz-sys = "1.0"
 
 [build-dependencies]
-bindgen = "0.36.1"
+bindgen = "0.37"
 cc = "1.0"

src/jsimpls.rs

@@ -183,9 +183,9 @@ impl JSAutoCompartment {
 impl JS::AutoGCRooter {
     pub fn new_unrooted(tag: JS::AutoGCRooterTag) -> JS::AutoGCRooter {
         JS::AutoGCRooter {
-            down: ptr::null(),
+            down: ptr::null_mut(),
             tag_: tag as isize,
-            stackTop: ptr::null(),
+            stackTop: ptr::null_mut(),
         }
     }