update minimum required to 3.1

fix warnings like: > CMake Deprecation Warning at CMakeLists.txt:1 (cmake_minimum_required): > Compatibility with CMake < 2.8.12 will be removed from a future version of > CMake. also ref. 338
jrl-umi3218 · Aug 16, 2021 · d072e8d · d072e8d
1 parent b0b0f47
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diff --git a/_unittests/python/CMakeLists.txt b/_unittests/python/CMakeLists.txt
@@ -1,5 +1,4 @@
-# Target-based approach should work from CMake 2.8.12 but it should fully work from 3.1
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.1)
 
 # These variables have to be defined before running SETUP_PROJECT
 set(PROJECT_NAME jrl-cmakemodules-python)

diff --git a/gtest/CMakeLists.txt.in b/gtest/CMakeLists.txt.in
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.2)
+cmake_minimum_required(VERSION 3.1)
 
 project(gtest NONE)