message: release increment
diff: set (GUDHI_MAJOR_VERSION 3)
  set (GUDHI_MINOR_VERSION 2)
  -set (GUDHI_PATCH_VERSION 0a1)
  +set (GUDHI_PATCH_VERSION 0a2)
  set(GUDHI_VERSION ${GUDHI_MAJOR_VERSION}.${GUDHI_MINOR_VERSION}.${GUDHI_PATCH_VERSION})
  message(STATUS "GUDHI version : ${GUDHI_VERSION}")
  