remove unnecessary dependencies (#144)

* remove unnecessary dependencies

* replace urllib3 dependency

schwab/auth.py

@@ -2,13 +2,13 @@
 from prompt_toolkit import prompt
 
 import contextlib
+import httpx
 import json
 import logging
 import multiprocessing
 import os
 import psutil
 import queue
-import requests
 import sys
 import time
 import urllib
@@ -341,11 +341,11 @@ def callback_server():
                             'ignore',
                             category=urllib3.exceptions.InsecureRequestWarning)
 
-                    resp = requests.get(
+                    resp = httpx.get(
                             'https://127.0.0.1:{}/schwab-py-internal/status'.format(
                                 callback_port), verify=False)
                 break
-            except requests.exceptions.ConnectionError as e:
+            except httpx.ConnectError as e:
                 pass
 
             time.sleep(0.1)

setup.py

@@ -36,9 +36,8 @@
         'httpx',
         'prompt_toolkit',
         'psutil',
-        'requests',
         'python-dateutil',
-        'selenium',
+        'urllib3',
         'websockets'
     ],
     extras_require={