Add requests as a hard dependency to integration (#1146)

Author: lzchen

contrib/opencensus-ext-requests/CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## Unreleased
 
+- Add `requests` library as a hard dependency
+([#1146](https://github.com/census-instrumentation/opencensus-python/pull/1146))
+
 ## 0.7.5
 Released 2021-05-13
 

contrib/opencensus-ext-requests/setup.py

@@ -42,6 +42,7 @@
     long_description=open('README.rst').read(),
     install_requires=[
         'opencensus >= 0.9.dev0, < 1.0.0',
+        'requests >= 2.19.0, < 3.0.0',
         'wrapt >= 1.0.0, < 2.0.0',
     ],
     extras_require={},