Revert "Added Wconversion so the gcc/clang warnings will be more similar to W4 on MSVC."

This reverts commit 0a2bd8935391e42f2581ec4826f7ac5f8fc9041a.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1e933d2..b799a62 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -37,7 +37,6 @@
 else()

   add_cxx_compiler_flag(-Wall)

 endif()
-add_cxx_compiler_flag(-Wconversion)
 add_cxx_compiler_flag(-Wextra)
 add_cxx_compiler_flag(-Wshadow)
 add_cxx_compiler_flag(-Werror RELEASE)