feat: load de json se o ficheiro colocado no [1] for um json

earthquakes.py

@@ -35,7 +35,7 @@ def guardar_df(df: pd.DataFrame, fname: str) -> bool:
 def guardar_json(df: pd.DataFrame, fname: str) -> bool:
     with open(fname , "w") as fp:
         try:
-            json.dump(df.to_json(), fp)
+            df.to_json(fp)
         except:
             return False
     return True
@@ -67,7 +67,10 @@ def main():
                 if fname is None:
                     fname = "dados.txt"
 
-                if _file_exists(fname):
+                if _file_exists(fname) and fname.endswith(".json"):
+                    db = pd.read_json(fname)
+                    input("Base de dados populada. Enter para voltar ao menu inicial")
+                elif _file_exists(fname):
                     db = parser.parse(fname)
                     input("Base de dados populada. Enter para voltar ao menu inicial")
                 else: