Fix constant name for version

src/main.cpp

@@ -1,6 +1,6 @@
-#include <spdlog.h>
+#include <spdlog/spdlog.h>
 
-int main (int, char**) {
-    spdlog::info("shmem version  {}", PROJECT_VERSION);
+int main(int, char**) {
+    spdlog::info("shmem version  {}", PROJ_VERSION);
     return 0;
 }