Add "fast" keyword as extra requirement

To be used instead of "tgcrypto"

setup.py

@@ -173,7 +173,10 @@ setup(
     packages=find_packages(exclude=["compiler*"]),
     zip_safe=False,
     install_requires=read("requirements.txt"),
-    extras_require={"tgcrypto": ["tgcrypto==1.1.1"]},
+    extras_require={
+        "tgcrypto": ["tgcrypto==1.1.1"],  # TODO: Remove soon
+        "fast": ["tgcrypto==1.1.1"],
+    },
     cmdclass={
         "clean": Clean,
         "generate": Generate