Make FakeGpt default provider

Author: Simatwa

.github/workflows/python-package.yml

@@ -39,4 +39,4 @@ jobs:
     - name: Test with Unittest
       run: |
         python -m unittest discover -s tests -p 'test_utils.py' -f -v
-        python -m unittest discover -s tests -p 'test_leo.py' -f -v
+        python -m unittest discover -s tests -p 'test_gpt4free.py' -f -v

src/pytgpt/gpt4free/main.py

@@ -26,7 +26,7 @@
 class GPT4FREE(Provider):
     def __init__(
         self,
-        provider: str = "Aura",
+        provider: str = "FakeGpt",
         is_conversation: bool = True,
         auth: str = None,
         max_tokens: int = 600,