Merge branch 'feature/require-cmake-3.1' into 'master'
[cmake] Require CMake 3.1 similar to dune-common
See merge request !258 (merged)
(cherry picked from commit d48b9b64)
1a567c45 [cmake] Require CMake 3.1 similar to dune-common
[cmake] Require CMake 3.1 similar to dune-common
See merge request !258 (merged)
(cherry picked from commit d48b9b64)
1a567c45 [cmake] Require CMake 3.1 similar to dune-common