[tagpr] update CHANGELOG.md

CHANGELOG.md

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+# Changelog
+
+## [v0.2.6](https://github.com/route06/aws-cost-cli/commits/v0.2.6) - 2024-06-13
+- Specify 'ROUTE06, Inc.' as an author of this forked version by @Rindrics in https://github.com/route06/aws-cost-cli/pull/10
+- Abolish PR template which does not fit our operation by @Rindrics in https://github.com/route06/aws-cost-cli/pull/11
+- Enable testing by 'jest' on CI by @Rindrics in https://github.com/route06/aws-cost-cli/pull/12
+- Introduce 'tagpr' to automate bumping semantic version by @Rindrics in https://github.com/route06/aws-cost-cli/pull/13
+- Introduce linter and formatter to the project by @Rindrics in https://github.com/route06/aws-cost-cli/pull/15
+- Enable use case with RBAC to improve security by @Rindrics in https://github.com/route06/aws-cost-cli/pull/16