Release 2.1.2

Suggested in https://github.com/taiki-e/install-action/issues/43#issuecomment-1372352184.

CHANGELOG.md

@@ -10,6 +10,10 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 
 ## [Unreleased]
 
+## [2.1.2] - 2023-01-05
+
+- Diagnostic improvements.
+
 ## [2.1.1] - 2023-01-05
 
 - Emit warning if tool is not specified.
@@ -516,7 +520,8 @@ Note: This release is considered a breaking change because installing on version
 
 Initial release
 
-[Unreleased]: https://github.com/taiki-e/install-action/compare/v2.1.1...HEAD
+[Unreleased]: https://github.com/taiki-e/install-action/compare/v2.1.2...HEAD
+[2.1.2]: https://github.com/taiki-e/install-action/compare/v2.1.1...v2.1.2
 [2.1.1]: https://github.com/taiki-e/install-action/compare/v2.1.0...v2.1.1
 [2.1.0]: https://github.com/taiki-e/install-action/compare/v2.0.3...v2.1.0
 [2.0.3]: https://github.com/taiki-e/install-action/compare/v2.0.2...v2.0.3

main.sh

@@ -420,7 +420,7 @@ if ! type -P jq &>/dev/null || ! type -P curl &>/dev/null || ! type -P tar &>/de
 fi
 
 if [[ ${#tools[@]} -eq 0 ]]; then
-    warn "no tool specified; this may caused by dependabot bug that handles '@<tool>' shorthand in wrong way"
+    warn "no tool specified; this could be caused by a dependabot bug where @<tool_name> tags on this action are replaced by @<version> tags"
     # Exit with 0 for backward compatibility, we want to reject it in the next major release.
     exit 0
 fi