Fix README

README.md

@@ -11,7 +11,7 @@ We mirror the version numbers of [agda-stdlib](https://github.com/agda/agda-stdl
 | [v2.6.3](https://github.com/agda/agda/releases/tag/v2.6.3) | [v1.7.2](https://github.com/agda/agda-stdlib/releases/tag/v1.7.2) | [v1.7.2](https://github.com/omelkonian/agda-stdlib-classes/releases/tag/v1.7.2) | [v1.7.2](https://github.com/omelkonian/agda-stdlib-meta/releases/tag/v1.7.2) |
 | [v2.6.4](https://github.com/agda/agda/releases/tag/v2.6.4) | [v1.7.3](https://github.com/agda/agda-stdlib/releases/tag/v1.7.3) | [v1.7.3](https://github.com/omelkonian/agda-stdlib-classes/releases/tag/v1.7.3) | [v1.7.3](https://github.com/omelkonian/agda-stdlib-meta/releases/tag/v1.7.3) |
 | [v2.6.4](https://github.com/agda/agda/releases/tag/v2.6.4) | [v2.0](https://github.com/agda/agda-stdlib/releases/tag/v2.0) | [v2.0](https://github.com/omelkonian/agda-stdlib-classes/releases/tag/v2.0) | [v2.0](https://github.com/omelkonian/agda-stdlib-meta/releases/tag/v2.0) |
-| [v2.6.4](https://github.com/agda/agda/releases/tag/v2.6.4) | [v2.0](https://github.com/agda/agda-stdlib/releases/tag/v2.1) | [v2.0](https://github.com/omelkonian/agda-stdlib-classes/releases/tag/v2.0) | [v2.0](https://github.com/omelkonian/agda-stdlib-meta/releases/tag/v2.1) |
+| [v2.6.4](https://github.com/agda/agda/releases/tag/v2.6.4) | [v2.1](https://github.com/agda/agda-stdlib/releases/tag/v2.1) | [v2.0](https://github.com/omelkonian/agda-stdlib-classes/releases/tag/v2.0) | [v2.1](https://github.com/omelkonian/agda-stdlib-meta/releases/tag/v2.1) |
 | [v2.7.0](https://github.com/agda/agda/releases/tag/v2.7.0) | [v2.1.1](https://github.com/agda/agda-stdlib/releases/tag/v2.0) | [v2.0](https://github.com/omelkonian/agda-stdlib-classes/releases/tag/v2.0) | [v2.1.1](https://github.com/omelkonian/agda-stdlib-meta/releases/tag/v2.1.1) |
 
 Minor revisions will append to these major versions (e.g. `v1.7.3b` or `v1.7.3.10`).