litrs breaking changes

• v0.5.1 \u2192 v1.0.0breaking

  Document semver guarantees

• v0.4.2 \u2192 v0.5.0breaking

  **Breaking**: Remove `proc-macro2` from default features

• v0.4.2 \u2192 v0.5.0breaking

  **Breaking**: Make `StringLit<String>::into_value` return `String` instead of `Cow<'static, str>`. Make `ByteStringLit<String>::into_value` return `Vec<u8>` instead of `Cow<'static, [u8]>`.

• v0.4.2 \u2192 v0.5.0breaking

  Add support for C string literals

• v0.4.2 \u2192 v0.5.0breaking

  Limit number of `#` as delimiter of raw string literals to 256 (to align with spec)

• v0.4.2 \u2192 v0.5.0breaking

  Fix license in `Cargo.toml` to use proper SPDX format (in #19, thanks @atouchet)

• v0.3.0 \u2192 v0.4.0breaking

  **Breaking**: Fix integer parsing for cases like `27f32`. `Literal::parse` and `IntegerLit::parse` will both identify this as an integer literal.

• v0.3.0 \u2192 v0.4.0breaking

  **Breaking**: Fix float parsing by correctly rejecting inputs like `27f32`. A float literal must have a period OR an exponent part, according to the spec. Previously decimal integers were accepted in `FloatLit::parse`.

• v0.3.0 \u2192 v0.4.0breaking

  Improved some parts of the docs

• v0.2.3 \u2192 v0.3.0breaking

  Bump MSRV (minimal supported Rust version) to 1.54

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