fix module wrapt as normal install dependancy (#123)

diff --git a/setup.py b/setup.py
index c7a9086..ec24ee2 100644
--- a/setup.py
+++ b/setup.py
@@ -39,6 +39,7 @@
         "grpcio",
         "grpcio-tools",
         "packaging",
+        "wrapt",
     ],
     extras_require={
         "test": [