bump CMake minimum version to use new behavior of CMP0048 (#1052)

* Use CMP0048 New behavior

CMP0048 NEW behavior sets PROJECT_VERSION variables to empty strings if
project() is called with no VERSION argument. This could be a problem
for packages that set VERSION variables prior to project() because
project() would then clear them, but catkin does not do this.

Signed-off-by: Shane Loretz <sloretz@osrfoundation.org>

* try raising the minimum CMake version instead

Co-authored-by: Dirk Thomas <dirk-thomas@users.noreply.github.com>

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.3)
+cmake_minimum_required(VERSION 3.0.2)
 
 set(catkin_EXTRAS_DIR ${CMAKE_CURRENT_SOURCE_DIR}/cmake)