Fix serde typo.

examples/serde.rs

@@ -56,7 +56,7 @@ mod example {
         let result: Dynamic = engine
             .eval(
                 r#"
-                    ##{
+                    #{
                         a: 42,
                         b: [ "hello", "world" ],
                         c: true,

src/serde/de.rs

@@ -23,14 +23,6 @@ use serde::de::{EnumAccess, VariantAccess};
 
 use crate::stdlib::{any::type_name, boxed::Box, fmt, string::ToString};
 
-#[cfg(not(feature = "no_std"))]
-#[cfg(not(target_arch = "wasm32"))]
-use crate::stdlib::time::Instant;
-
-#[cfg(not(feature = "no_std"))]
-#[cfg(target_arch = "wasm32")]
-use instant::Instant;
-
 /// Deserializer for `Dynamic` which is kept as a reference.
 ///
 /// The reference is necessary because the deserialized type may hold references