Fix bitflags 0.9 syntax

Author: dtolnay

Diff for: README.md

@@ -1570,9 +1570,9 @@ extern crate bitflags;
 
 bitflags! {
     struct Flags: u32 {
-        const FLAG_A = 0b00000001,
-        const FLAG_B = 0b00000010,
-        const FLAG_C = 0b00000100,
+        const FLAG_A = 0b00000001;
+        const FLAG_B = 0b00000010;
+        const FLAG_C = 0b00000100;
     }
 }