remove unnecessary lifetime bound from Bindings::write

Author: Jorge Aparicio

src/lib.rs

@@ -172,7 +172,7 @@ impl Bindings {
         self.write(Box::new(file))
     }
 
-    pub fn write<'a>(&'a self, mut writer: Box<Write + 'a>) -> io::Result<()> {
+    pub fn write<'a, 'b>(&'a self, mut writer: Box<Write + 'b>) -> io::Result<()> {
         try!(writer.write("/* automatically generated by rust-bindgen */\n\n".as_bytes()));
         let mut ps = pprust::rust_printer(writer);
         try!(ps.print_mod(&self.module, &[]));
@@ -249,4 +249,4 @@ fn builder_state()
     assert!(build.logger.is_some());
     assert!(build.options.clang_args.binary_search(&"example.h".to_string()).is_ok());
     assert!(build.options.links.binary_search(&("m".to_string(), LinkType::Static)).is_ok());
-}
+}