Update CITATION.cff

Author: pancetta

CITATION.cff

@@ -6,7 +6,7 @@ authors:
     given-names: Robert
     orcid: "https://orcid.org/https://orcid.org/0000-0002-3879-1210"
 cff-version: "1.1.0"
-date-released: 2021-08-12
+date-released: 2021-10-21
 doi: "10.5281/zenodo.5179803"
 keywords: 
   - "parallel-in-time integration"
@@ -18,4 +18,4 @@ license: "BSD 2-Clause \"Simplified\" License"
 message: "If you use this software, please cite it using these metadata."
 repository-code: "https://github.com/Parallel-in-Time/pySDC/releases/tag/4.1.1"
 title: "Parallel-in-Time/pySDC"
-version: "4.1.1"
+version: "4.2"