issue #36 - env variables: added the dotenv module and fixed requirements.txt

Since the .env file will be igonred you need to create a .env file in the root of the project. here are my variables TOR_HOST=socks5h://127.0.0.1 TOR_PORT=9050 WEBSOCKET_PORT=3030

SimpleX/main.py

@@ -1,14 +1,20 @@
 from websockets.sync.client import connect
+from dotenv import load_dotenv
+
 import json
 import random
+import os
 
+load_dotenv()
 
+websocket_port = os.environ.get("WEBSOCKET_PORT")
+print(websocket_port)
 
 def is_simplex_link_valid(simplex_link: str) -> bool:
     """
     Connects to the group using the `simplex_link`. If the response contains error False will be returned else True.
     """
-    with connect("ws://localhost:3030") as websocket:
+    with connect(f"ws://localhost:{websocket_port}") as websocket:
         query = f"/c incognito {simplex_link}"
         command = {
             'corrId': f"id{random.randint(0,999999)}",