Removed "requests" library dependency (#40)

* Used urllib to send event.

* Corrected setup.py

Author: popovaan

Diff for: requirements.txt

@@ -1 +0,0 @@
-requests>=2.20.0

Diff for: setup.py

@@ -53,6 +53,5 @@ def find_package_modules(self, package, package_dir):
           'Programming Language :: Python :: 3',
           'License :: OSI Approved :: Apache Software License',
           'Operating System :: OS Independent',
-      ],
-      install_requires=['requests>=2.20.0'],
+      ]
       )

Diff for: src/backend/backend_ga.py

@@ -3,6 +3,7 @@
 
 import logging as log
 import uuid
+from urllib import request, parse
 
 from .backend import TelemetryBackend
 from ..utils.guid import get_or_generate_uid, remove_uid_file
@@ -32,8 +33,9 @@ def send(self, message: Message):
         if self.uid is None:
             message.attrs['cid'] = str(uuid.uuid4())
         try:
-            import requests
-            requests.post(self.backend_url, message.attrs, timeout=1.0)
+            data = parse.urlencode(message.attrs).encode()
+            req = request.Request(self.backend_url, data=data)
+            request.urlopen(req)
         except Exception as err:
             log.warning("Failed to send event with the following error: {}".format(err))