Increment version

Author: SimonMaracine

README.md

@@ -60,7 +60,7 @@ int main() {
     auto baz {foo.lock()};
 
     if (baz) {
-        std::cout << "This is never printed\n";
+        std::cout << "This never gets printed\n";
     }
 }
 ```

src/cpp_shared_ref/version.hpp

@@ -2,6 +2,6 @@
 
 namespace sm {
     inline constexpr unsigned int VERSION_MAJOR {0};
-    inline constexpr unsigned int VERSION_MINOR {3};
+    inline constexpr unsigned int VERSION_MINOR {4};
     inline constexpr unsigned int VERSION_PATCH {0};
 }