bitflags breaking changes

• 2.0.0-rc.1 \u2192 2.0.0-rc.2breaking

  Add missing "if" to contains doc-comment in traits.rs by @rusty-snake in https://github.com/bitflags/bitflags/pull/291

• 2.0.0-rc.1 \u2192 2.0.0-rc.2breaking

  Forbid unsafe_code by @fintelia in https://github.com/bitflags/bitflags/pull/294

• 2.0.0-rc.1 \u2192 2.0.0-rc.2breaking

  serde: enable no-std support by @nim65s in https://github.com/bitflags/bitflags/pull/296

• 2.0.0-rc.1 \u2192 2.0.0-rc.2breaking

  Add a parser for flags formatted as bar-separated-values by @KodrAus in https://github.com/bitflags/bitflags/pull/297

• 2.0.0-rc.1 \u2192 2.0.0-rc.2breaking

  @rusty-snake made their first contribution in https://github.com/bitflags/bitflags/pull/291

• 2.0.0-rc.1 \u2192 2.0.0-rc.2breaking

  @fintelia made their first contribution in https://github.com/bitflags/bitflags/pull/294

• 2.0.0-rc.1 \u2192 2.0.0-rc.2breaking

  @nim65s made their first contribution in https://github.com/bitflags/bitflags/pull/296

• 2.0.0-rc.3 \u2192 2.0.0breaking

  Use SPDX license format by @atouchet in https://github.com/bitflags/bitflags/pull/272

• 2.0.0-rc.3 \u2192 2.0.0breaking

  serde tests fail in CI by @arturoc in https://github.com/bitflags/bitflags/pull/277

• 2.0.0-rc.3 \u2192 2.0.0breaking

  Fix beta test output by @KodrAus in https://github.com/bitflags/bitflags/pull/279

• 2.0.0-rc.3 \u2192 2.0.0breaking

  Prepare for 2.0.0-rc.2 release by @KodrAus in https://github.com/bitflags/bitflags/pull/299

• 2.0.0-rc.3 \u2192 2.0.0breaking

  Iterator over all the enabled options by @arturoc in https://github.com/bitflags/bitflags/pull/278

• 2.0.0-rc.3 \u2192 2.0.0breaking

  from_bits_(truncate) fail with composite flags by @arturoc in https://github.com/bitflags/bitflags/pull/276

• 2.0.0-rc.3 \u2192 2.0.0breaking

  Add more platform coverage to CI by @KodrAus in https://github.com/bitflags/bitflags/pull/280

• 2.0.0-rc.3 \u2192 2.0.0breaking

  rework the way cfgs are handled by @KodrAus in https://github.com/bitflags/bitflags/pull/281

• 2.0.0-rc.3 \u2192 2.0.0breaking

  Split generated code into two types by @KodrAus in https://github.com/bitflags/bitflags/pull/282

• 2.0.0-rc.3 \u2192 2.0.0breaking

  expose bitflags iters using nameable types by @KodrAus in https://github.com/bitflags/bitflags/pull/286

• 2.0.0-rc.3 \u2192 2.0.0breaking

  Support creating flags from their names by @KodrAus in https://github.com/bitflags/bitflags/pull/287

• 2.0.0-rc.3 \u2192 2.0.0breaking

  Update README.md by @KodrAus in https://github.com/bitflags/bitflags/pull/288

• 2.0.0-rc.3 \u2192 2.0.0breaking

  Prepare for 2.0.0-rc.1 release by @KodrAus in https://github.com/bitflags/bitflags/pull/289

• 2.0.0-rc.3 \u2192 2.0.0breaking

  Add missing "if" to contains doc-comment in traits.rs by @rusty-snake in https://github.com/bitflags/bitflags/pull/291

• 2.0.0-rc.3 \u2192 2.0.0breaking

  Forbid unsafe_code by @fintelia in https://github.com/bitflags/bitflags/pull/294

• 2.0.0-rc.3 \u2192 2.0.0breaking

  serde: enable no-std support by @nim65s in https://github.com/bitflags/bitflags/pull/296

• 2.0.0-rc.3 \u2192 2.0.0breaking

  Add a parser for flags formatted as bar-separated-values by @KodrAus in https://github.com/bitflags/bitflags/pull/297

• 2.0.0-rc.3 \u2192 2.0.0breaking

  Use strip_prefix instead of starts_with + slice by @QuinnPainter in https://github.com/bitflags/bitflags/pull/301

• 2.0.0-rc.3 \u2192 2.0.0breaking

  Add example to the README.md file by @tiaanl in https://github.com/bitflags/bitflags/pull/270

• 2.0.0-rc.3 \u2192 2.0.0breaking

  Fix a typo and call out MSRV bump by @KodrAus in https://github.com/bitflags/bitflags/pull/259

• 2.0.0-rc.3 \u2192 2.0.0breaking

  BitFlags trait by @arturoc in https://github.com/bitflags/bitflags/pull/220

• 2.0.0-rc.3 \u2192 2.0.0breaking

  Add a hidden trait to discourage manual impls of BitFlags by @KodrAus in https://github.com/bitflags/bitflags/pull/261

• 2.0.0-rc.3 \u2192 2.0.0breaking

  Sanitize `Ok` by @konsumlamm in https://github.com/bitflags/bitflags/pull/266

• 2.0.0-rc.3 \u2192 2.0.0breaking

  Fix bug in `Debug` implementation by @konsumlamm in https://github.com/bitflags/bitflags/pull/268

• 2.0.0-rc.3 \u2192 2.0.0breaking

  Fix a typo in the generated documentation by @wackbyte in https://github.com/bitflags/bitflags/pull/271

• 0.9.1 \u2192 1.0.0breaking

  Other improvements to unit tests and documentation ([#106] and [#115])

• 0.9.1 \u2192 1.0.0breaking

  **[breaking change]** Minimum supported version is Rust **1.20**, due to usage of associated constants

• 0.9.1 \u2192 1.0.0breaking

  **[breaking change]** Macro now generates [associated constants](https://doc.rust-lang.org/reference/items.html#associated-constants) ([#24])

• 0.9.1 \u2192 1.0.0deprecated

  After being broken in 0.9, the `#[deprecated]` attribute is now supported again ([#112])

• 0.8.2 \u2192 0.9.0breaking

  Printing an empty flag value with the `Debug` trait now prints "(empty)" instead of nothing ([#85])

• 0.8.2 \u2192 0.9.0breaking

  The `bitflags!` macro can now be used inside of a fn body, to define a type local to that function ([#74])

• 0.8.2 \u2192 0.9.0breaking

  **[breaking change]** Use struct keyword instead of flags to define bitflag types ([#84])

• 0.8.2 \u2192 0.9.0breaking

  **[breaking change]** Terminate const items with semicolons instead of commas ([#87])

• 0.8.2 \u2192 0.9.0breaking

  Implement the `Hex`, `Octal`, and `Binary` formatting traits ([#86])

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