Fixed CMake version

Author: rijnb

CMakeLists.txt

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-cmake_minimum_required(VERSION 3.3)
+cmake_minimum_required(VERSION 3.5)
 project(mapcode_cpp)
 
 # The debug configuration adds the "address sanitizer" to check for out of bounds behavior and such.