fix：时间戳int to string

pc_ptt.py

@@ -163,7 +163,7 @@ def reptile(browser=None, search_word=""):
                         "reptileTime": str(int(time.time())),
                         "type": content_type,
                         "author": element_author.text,
-                        "releaseTime": release_time,
+                        "releaseTime": str(release_time),
                         "picture_url": ",".join(picture_url)
                     }
                     # --------------- 组装数据 end---------------------