Add dev dependencies

setup.py

@@ -25,6 +25,9 @@ setup(
         "dnspython",
         "miniupnpc",
     ],
+    extras_require={
+        "dev": ["pytest", "black", "pyflakes", "mock", "httpretty"]
+    },
     entry_points={
         "console_scripts": ["urlchecker=urlchecker_cli:runUrlChecker "]
     },