Update minimum requirements

Author: delivrance

README.md

@@ -12,7 +12,7 @@ cryptographic algorithms Telegram requires, namely:
 
 ## Requirements
 
-- Python 3.6 or higher.
+- Python 3.7 or higher.
 
 ## Installation
 

setup.py

@@ -40,7 +40,6 @@
         "Programming Language :: C",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
@@ -63,7 +62,7 @@
         "Source": "https://github.com/pyrogram/tgcrypto",
         "Documentation": "https://docs.pyrogram.org",
     },
-    python_requires="~=3.6",
+    python_requires="~=3.7",
     packages=find_packages(),
     test_suite="tests",
     zip_safe=False,