fix: add requests as a dependency (#271)

Co-authored-by: Peter Lamut <[email protected]>

Author: HemangChothani

setup.py

@@ -32,6 +32,7 @@
     "google-auth >= 1.11.0, < 2.0dev",
     "google-cloud-core >= 1.4.1, < 2.0dev",
     "google-resumable-media >= 1.0.0, < 2.0dev",
+    "requests >= 2.18.0, < 3.0.0dev",
 ]
 extras = {}