change install requirement psycopg2-binary to psycopg2

Author: petrem

contrib/opencensus-ext-postgresql/setup.py

@@ -42,7 +42,7 @@
     long_description=open('README.rst').read(),
     install_requires=[
         'opencensus >= 0.9.dev0, < 1.0.0',
-        'psycopg2-binary >= 2.7.3.1',
+        'psycopg2 >= 2.7.3.1',
     ],
     extras_require={},
     license='Apache-2.0',