Remove requests dependency

Author: lzpap

examples/hello_world.py

@@ -11,8 +11,7 @@
 from pprint import pprint
 from sys import argv
 from typing import Text
-
-from requests.exceptions import ConnectionError
+from httpx.exceptions import NetworkError
 from six import text_type
 
 from iota import BadApiResponse, StrictIota, __version__
@@ -24,7 +23,7 @@ def main(uri):
 
     try:
         node_info = api.get_node_info()
-    except ConnectionError as e:
+    except NetworkError as e:
         print(
             "Hm.  {uri} isn't responding; is the node running?".format(uri=uri)
         )

setup.py

@@ -66,10 +66,6 @@
         'httpx',
         'phx-filters; python_version >= "3.5"',
         'pysha3',
-
-        # ``security`` extra wasn't introduced until 2.4.1
-        # http://docs.python-requests.org/en/latest/community/updates/#id35
-        'requests[security] >= 2.4.1',
         'six',
         'typing; python_version < "3.0"',
     ],