Update unindent requirement from 0.1.9 to 0.2.1

[dependabot]

Updates the requirements on unindent to permit the latest version.

Release notes

Sourced from unindent's releases.

0.2.1

• Add an unstable feature that changes the implementation to be a Macros 2.0 macro. This is required in call sites that need a string literal rather than just a &'static str, such as in a format string. (#12)

  [dependencies]
  indoc = { version = "0.2.1", features = ["unstable"] }

  #![feature(proc_macro)]
  extern crate indoc;
  use indoc::indoc;
  fn main() {
  let username = "Boscop";
  let body = "Check this out";
  let message = format!(
      indoc!("
          Hello {username}
          ======{underline}
      {body}
  "),
  username = username,
  underline = "=".repeat(username.len()),
  body = body,
  
  );
  print!("{}", message);
  
  }

Commits

• 8355779 Release 0.2.1
• 5450dc0 Merge pull request #14 from dtolnay/old
• a0038b1 Support compiling on Rust 1.15
• ef0a7a6 Merge pull request #13 from dtolnay/proc-macro
• 68642ff Real proc macro implementation behind unstable cfg
• b46f52d Combine the run-pass tests into an ordinary test file
• 5694843 Release 0.2.0
• 84a3e38 Copy readme content to rustdoc
• 120f94d Set html_root_url
• 9ca73f9 Update readme for 0.2
• Additional commits viewable in compare view

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