add release history

README.md

@@ -25,7 +25,8 @@ Following the first [CLEF-HIPE-2020](https://impresso.github.io/CLEF-HIPE-2020)
       - 22.03.2022: [v2.0](https://github.com/hipe-eval/HIPE-2022-data/releases/tag/v2.0)    
       - 15.04.2022: [v2.1](https://github.com/hipe-eval/HIPE-2022-data/releases/tag/v2.1)   
       - 26.04.2022: commit of all-masked test files for bundle 1 to 4 in data v2.1 ([cf. PR#7](https://github.com/hipe-eval/HIPE-2022-data/pull/7))     
-      - 05.05.2022: commit of EL-masked test files for bundle 5 in data v2.1 ([cf. PR#10](https://github.com/hipe-eval/HIPE-2022-data/pull/10)) 
+      - 05.05.2022: commit of EL-masked test files for bundle 5 in data v2.1 ([cf. PR#10](https://github.com/hipe-eval/HIPE-2022-data/pull/10))     
+      - 13.05.2022: release of test files (except topres19th) used for the evaluation on 13.05.2022.
 
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