Drop custom zeroconf package (fixes #14)

setup.py

@@ -33,7 +33,9 @@ setup(
     keywords='cli',
     packages=find_packages(exclude=['docs']),
     package_data={'opendrop': ['certs/*.pem']},
-    install_requires=['requests', 'fleep', 'ifaddr', 'Pillow', 'requests_toolbelt', 'ctypescrypto', 'libarchive-c'],
+    install_requires=[
+        'Pillow', 'ctypescrypto', 'fleep', 'ifaddr', 'libarchive-c', 'requests', 'requests_toolbelt', 'zeroconf>=0.24.2'
+    ],
     entry_points={
         'console_scripts': [
             'opendrop=opendrop.cli:main',