RUST-457 Fix Display implementation for Binary type (#180)

Author: isabelatkinson

src/bson.rs

@@ -130,7 +130,7 @@ impl Display for Bson {
             }
             Bson::Binary(Binary { subtype, ref bytes }) => write!(
                 fmt,
-                "BinData({}, 0x{})",
+                "BinData({:#x}, {})",
                 u8::from(subtype),
                 base64::encode(bytes)
             ),

tests/modules/macros.rs

@@ -39,8 +39,8 @@ fn standard_format() {
         "{{ float: 2.4, string: \"hello\", array: [\"testing\", 1, true, [1, 2]], doc: {{ fish: \
          \"in\", a: \"barrel\", !: 1 }}, bool: true, null: null, regexp: /s[ao]d/i, \
          with_wrapped_parens: -20, code: function(x) {{ return x._id; }}, i32: 12, i64: -55, \
-         timestamp: Timestamp(0, 229999444), binary: BinData(5, 0x{}), encrypted: BinData(6, \
-         0x{}), _id: ObjectId(\"{}\"), date: Date(\"{}\") }}",
+         timestamp: Timestamp(0, 229999444), binary: BinData(0x5, {}), encrypted: BinData(0x6, \
+         {}), _id: ObjectId(\"{}\"), date: Date(\"{}\") }}",
         base64::encode("thingies"),
         base64::encode("secret"),
         hex::encode(id_string),