Add space to return type

Author: hansolshin

tokio-postgres/src/error/mod.rs

@@ -422,7 +422,7 @@ impl Error {
     }
 
     /// Determines if the error was associated with closed connection.
-    pub fn is_closed(&self) -> bool{
+    pub fn is_closed(&self) -> bool {
         self.0.kind == Kind::Closed
     }