Add pytest-socket

This prevents SolanaClient from actually reaching out to any solana rpc
nodes to keep things nice and hermetic for unit testing.

Author: Jeff Schroeder

pytest.ini

@@ -0,0 +1,7 @@
+[pytest]
+addopts =
+    # Prevent SolanaClient from actually reaching out to devnet
+    --disable-socket
+    --allow-unix-socket
+    --cov=pythclient
+    --no-cov-on-fail

setup.py

@@ -10,6 +10,6 @@
     author_email='[email protected]',
     install_requires=requirements,
     extras_require={
-        'testing': requirements + ['pytest', 'pytest-cov'],
+        'testing': requirements + ['mock', 'pytest', 'pytest-cov', 'pytest-socket'],
     },
 )