hashmaps are now first class objects in the language

src/lisp_object.cpp

@@ -23,6 +23,7 @@ proc Lisp_Object_Type_to_string(Lisp_Object_Type type) -> const char* {
     case(Lisp_Object_Type::Pair):         return "pair";
     case(Lisp_Object_Type::Vector):       return "vector";
     case(Lisp_Object_Type::Pointer):      return "pointer";
+    case(Lisp_Object_Type::HashMap):      return "hashmap";
     }
     return "unknown";
 }