Update for Mac OS.

Author: BenBrock

include/binsparse/binsparse.hpp

@@ -13,7 +13,7 @@
 
 namespace binsparse {
 
-inline constexpr char* version = "0.1";
+inline const std::string version = "0.1";
 
 template <typename T>
 void write_dense_vector(H5::Group& f, std::span<T> v,