Bump thiserror from 1.0.20 to 1.0.21

[dependabot[bot]]

Bumps thiserror from 1.0.20 to 1.0.21.

Release notes

Sourced from thiserror's releases.

1.0.21

• Support capturing backtraces inside of Arc from a From impl, which makes it possible for errors having backtraces to be clonable (#102)

  use std::backtrace::Backtrace;
  use std::sync::Arc;
  use thiserror::Error;
  #[derive(Error, Debug, Clone)]
  #[error("...")]
  pub struct ClonableErrorWithBacktrace {
  #[from]
  source: Inner,
  #[backtrace]
  backtrace: Arc<Backtrace>,
  }
  

Commits

• f757a04 Release 1.0.21
• 56a4fa6 Merge pull request #102 from dtolnay/arc-backtrace-from
• c6dcc69 Generalize backtrace capture to From<Backtrace>
• 256576e Add test of capturing Arc<Backtrace>
• 1baf746 Merge pull request #101 from dtolnay/backtrace-from
• f83eb46 Add test of capturing Backtrace/Option<Backtrace> in a From impl
• bf947a2 Merge pull request #100 from dtolnay/arc-backtrace
• bd459c8 Add test involving Arc<Backtrace>
• 04b91d7 Change ui tests to work whether or not rust-src is installed
• 663d835 Update ui tests to nightly-2020-09-05
• Additional commits viewable in compare view

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