Update data.py

Replace proxy.com with example.com because proxy.com now has 2 IP addresses (tests don't always pass because different IPs are resolved).

tests/data/data.py

@@ -30,7 +30,7 @@
 IMAGE_FILE_BASE64 = base64.b64encode(IMAGE_FILE_BYTES)
 IMAGE_FILE_BASE64_STR = IMAGE_FILE_BASE64.decode('ascii')
 
-PROXY_ADDRESS = 'http://login:password@proxy.com:8080'
+PROXY_ADDRESS = 'http://login:password@example.com:8080'
 PROXY_OBJ = ProxyServer(PROXY_ADDRESS)
 PROXY_TYPE = 'HTTP'