lib: remove old try! macro

Fixes: rust-lang-deprecated#271

Author: mathstuf

src/lib.rs

@@ -648,14 +648,14 @@ impl<'a, T> fmt::Display for DisplayChain<'a, T>
 {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
         // Keep `try!` for 1.10 support
-        try!(writeln!(fmt, "Error: {}", self.0));
+        writeln!(fmt, "Error: {}", self.0)?;
 
         for e in self.0.iter().skip(1) {
-            try!(writeln!(fmt, "Caused by: {}", e));
+            writeln!(fmt, "Caused by: {}", e)?;
         }
 
         if let Some(backtrace) = self.0.backtrace() {
-            try!(writeln!(fmt, "{:?}", backtrace));
+            writeln!(fmt, "{:?}", backtrace)?;
         }
 
         Ok(())