Update changelog format

This is the format used by `rust-release-gh-action`.

README.md

@@ -109,7 +109,7 @@ your_crate = "0.1.2"
 
 This is a changelog describing the most important changes per release.
 
-### Version 0.9.4 — 2021-12-14
+### Version 0.9.4 (2021-12-14)
 
 - [#115](https://github.com/mgeisler/version-sync/pull/115): Expand
   `assert_markdown_deps_updated!` to also check version numbers such as
@@ -118,7 +118,7 @@ This is a changelog describing the most important changes per release.
   `assert_only_contains_regex!` macro which can ensure that all version numbers
   in a file are updated.
 
-### Version 0.9.3 — 2021-09-20
+### Version 0.9.3 (2021-09-20)
 
 - [#108](https://github.com/mgeisler/version-sync/pull/108): Make all
   dependencies optional. Thanks @rlee287!
@@ -127,21 +127,21 @@ This is a changelog describing the most important changes per release.
 - [#110](https://github.com/mgeisler/version-sync/pull/110): Add simple
   `check_contains_version` function.
 
-### Version 0.9.2 — 2021-02-13
+### Version 0.9.2 (2021-02-13)
 
 - [#94](https://github.com/mgeisler/version-sync/pull/94): Update pulldown-cmark
   to 0.8.
 - [#95](https://github.com/mgeisler/version-sync/pull/95): Fix `non_fmt_panic`
   lint error in latest nightly.
 
-### Version 0.9.1 — 2020-07-07
+### Version 0.9.1 (2020-07-07)
 
 - [#91](https://github.com/mgeisler/version-sync/pull/91): Pull in fewer
   dependencies. This optimizes the build time by 1-2 seconds.
 - [#92](https://github.com/mgeisler/version-sync/pull/92): Normalize `\r\n` to
   `\n` to ensure `^` and `$` always match line boundaries.
 
-### Version 0.9.0 — 2020-03-30
+### Version 0.9.0 (2020-03-30)
 
 Drop support for Rust 1.31.0 since our dependencies keep releasing new patch
 patch versions that push up the minimum required Rust version. At the time of
@@ -154,25 +154,25 @@ Issues closed:
   blockquotes
 - [#84][issue-84]: Release update to crates.io with syn 1.0
 
-### Version 0.8.1 — 2019-04-03
+### Version 0.8.1 (2019-04-03)
 
 Dependencies were relaxed to make it easier to upgrade version-sync.
 
-### Version 0.8.0 — 2019-03-28
+### Version 0.8.0 (2019-03-28)
 
 We now use [Rust 2018][rust-2018], which means we require Rust version 1.31.0 or
 later. The `assert_html_root_url_updated!` macro will again report accurate line
 numbers based on span information from the syn crate.
 
-### Version 0.7.0 — 2019-01-14
+### Version 0.7.0 (2019-01-14)
 
 Special characters are now correctly escaped in the `{name}` and `{version}`
 placeholders in `assert_contains_regex!`.
 
 Dependencies were updated and version-sync now requires Rust version 1.27.2 or
 later.
 
-### Version 0.6.0 — 2018-11-22
+### Version 0.6.0 (2018-11-22)
 
 You can use `assert_contains_regex!` to grep files for the current version
 number. The search is done with a regular expression where `{version}` is
@@ -195,31 +195,31 @@ Issues closed:
 - [#39][issue-39]: Version 0.5 requires Rust version 1.21.0
 - [#42][issue-42]: Handle Git dependencies
 
-### Version 0.5.0 — 2017-11-19
+### Version 0.5.0 (2017-11-19)
 
 Dependencies were updated and version-sync now requires Rust version 1.21 or
 later.
 
 Error messages from `assert_html_root_url_updated!` now again include line
 numbers (based on a heuristic until the syn crate can provide the information).
 
-### Version 0.4.0 — 2017-11-01
+### Version 0.4.0 (2017-11-01)
 
 This release replaces the dependency on the abandoned syntex_syntax with with a
 dependency on the much lighter syn crate. This improves compilation speed.
 Unfortunately, the syn crate does not provide information about line numbers, so
 error messages are are no longer as good. We might be able to work around that
 in a later version.
 
-### Version 0.3.1 — 2017-09-26
+### Version 0.3.1 (2017-09-26)
 
 This release fixes a small problem with the handling of pre-release identifiers.
 
 Issues closed:
 
 - [#19][issue-19]: Pre-release identifiers were ignored.
 
-### Version 0.3.0 — 2017-09-23
+### Version 0.3.0 (2017-09-23)
 
 When checking dependencies in READMEs, TOML blocks can now be excluded from the
 check by adding `no_sync` to the language line:
@@ -234,12 +234,12 @@ your_crate = "0.1"
 This TOML block will not be checked. This is similar to `no_run` for Rust code
 blocks.
 
-### Version 0.2.0 — 2017-09-20
+### Version 0.2.0 (2017-09-20)
 
 Added `assert_html_root_url_updated!` which will check that the `html_root_url`
 attribute points to the correct version of the crate documentation on docs.rs.
 
-### Version 0.1.3 — 2017-09-18
+### Version 0.1.3 (2017-09-18)
 
 First public release with support for finding outdated version numbers in
 `dependencies` and `dev-dependencies`.

tests/version-numbers.rs

@@ -9,7 +9,7 @@ fn test_readme_deps() {
 fn test_readme_changelog() {
     version_sync::assert_contains_regex!(
         "README.md",
-        r"^### Version {version} — 20\d\d-\d\d-\d\d$"
+        r"^### Version {version} \(20\d\d-\d\d-\d\d\)$"
     );
 }