fix: made fields inside location structure private

Author: nos1dot618

include/lbd/frontend/location.h

@@ -4,13 +4,13 @@
 
 namespace frontend {
     struct Location {
-        // TODO: Maybe make these members private.
-        size_t row;
-        size_t col;
-        std::string filepath;
-
         Location(size_t row, size_t col, std::string filepath);
 
         friend std::ostream &operator<<(std::ostream &stream, const Location &location);
+
+    private:
+        size_t row;
+        size_t col;
+        std::string filepath;
     };
 }