Release compatible with dune 2.7
Since !20 requires C++17, which is not required for the current dune release 2.7, a dune 2.7 compatible version of dune-vectorclass should be released.
Since !20 requires C++17, which is not required for the current dune release 2.7, a dune 2.7 compatible version of dune-vectorclass should be released.