removed requests as required dependency (#128)

diff --git a/setup.py b/setup.py
index 779baf1..0086f89 100644
--- a/setup.py
+++ b/setup.py
@@ -39,7 +39,6 @@
         "grpcio",
         "grpcio-tools",
         "packaging",
-        "requests",
         "wrapt",
     ],
     extras_require={