Add CMake minimum version required.

Gao Mingfei · Gao Mingfei · commit 1ce28f454bfa · 2020-04-10T14:50:51.000+08:00
Interface Libraries feature is not available before CMake 3.0

Signed-off-by: Gao Mingfei &lt;mingfei.gao@ucloud.cn&gt;
diff --git a/RapidJSONConfig.cmake.in b/RapidJSONConfig.cmake.in
@@ -1,3 +1,7 @@
+################################################################################
+# CMake minimum version required
+cmake_minimum_required(VERSION 3.0)
+
 ################################################################################
 # RapidJSON source dir
 set( RapidJSON_SOURCE_DIR "@CONFIG_SOURCE_DIR@")
