Make replacements happen for prereleases (#4)

Author: jamwaffles

release.toml

@@ -1,9 +1,9 @@
 no-dev-version = true
 pre-release-replacements = [
-  {file="CHANGELOG.md", search="[Uu]nreleased", replace="{{version}}"},
-  {file="CHANGELOG.md", search="\\.\\.\\.HEAD", replace="...{{tag_name}}"},
-  {file="CHANGELOG.md", search="ReleaseDate", replace="{{date}}"},
-  {file="CHANGELOG.md", search="<!-- next-header -->", replace="<!-- next-header -->\n\n## [Unreleased] - ReleaseDate"},
-  {file="CHANGELOG.md", search="<!-- next-url -->", replace="<!-- next-url -->\n[unreleased]: https://github.com/embedded-graphics/{{crate_name}}/compare/{{tag_name}}...HEAD"},
+  {file="CHANGELOG.md", prerelease=true, search="[Uu]nreleased", replace="{{version}}"},
+  {file="CHANGELOG.md", prerelease=true, search="\\.\\.\\.HEAD", replace="...{{tag_name}}"},
+  {file="CHANGELOG.md", prerelease=true, search="ReleaseDate", replace="{{date}}"},
+  {file="CHANGELOG.md", prerelease=true, search="<!-- next-header -->", replace="<!-- next-header -->\n\n## [Unreleased] - ReleaseDate"},
+  {file="CHANGELOG.md", prerelease=true, search="<!-- next-url -->", replace="<!-- next-url -->\n[unreleased]: https://github.com/embedded-graphics/{{crate_name}}/compare/{{tag_name}}...HEAD"},
 ]
 tag-message = "Release {{crate_name}} {{version}}"