test/CMakeLists.txt: bump cmake minimum required to 3.0 for consistency from a patchset by Vladislav Dmitrievich Turbanov: https://github.com/libsdl-org/SDL/pull/4062
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 8798005..322154c 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.11)
+cmake_minimum_required(VERSION 3.0.0)
project(SDL2 C)
# Global settings for all of the test targets