Display expected patterns/tokens in parse error when applicable.

We've never been using those 'expected' tokens captured during
  parsing, which is lame because they contain useful information!

  This is much better than merely showing our infamous

    "Try removing it!"

crates/aiken-project/src/error.rs

@@ -324,7 +324,7 @@ impl Diagnostic for Error {
                 "Try moving the shared code to a separate module that the others can depend on\n- {}",
                 modules.join("\n- ")
             ))),
-            Error::Parse { error, .. } => error.kind.help(),
+            Error::Parse { error, .. } => error.help(),
             Error::Type { error, .. } => error.help(),
             Error::StandardIo(_) => None,
             Error::MissingManifest { .. } => Some(Box::new(