Merge pull request #278 from compnerd/patch-1

Update CMakeLists.txt

Author: stephentyrone

CMakeLists.txt

@@ -11,7 +11,7 @@ cmake_minimum_required(VERSION 3.16)
 project(swift-numerics
   LANGUAGES Swift)
 
-list(APPEND CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake/modules)
+list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake/modules)
 
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)