feat: add rounds api (#96)

Author: dated

.codacy.yaml

@@ -0,0 +1,4 @@
+---
+exclude_paths:
+  - 'tests/**'
+  - '*.md'

client/api/rounds.py

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+from client.resource import Resource
+
+
+class Rounds(Resource):
+
+    def delegates(self, round_id):
+        return self.request_get('rounds/{}/delegates'.format(round_id))

tests/api/test_rounds.py

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+import json
+
+import responses
+
+from client import ArkClient
+
+
+def test_delegates_calls_correct_url():
+    round_id = '12345'
+    responses.add(
+        responses.GET,
+        'http://127.0.0.1:4002/rounds/{}/delegates'.format(round_id),
+        json={'success': True},
+        status=200
+    )
+
+    client = ArkClient('http://127.0.0.1:4002')
+    client.rounds.delegates(round_id)
+
+    assert len(responses.calls) == 1
+    assert responses.calls[0].request.url == 'http://127.0.0.1:4002/rounds/12345/delegates'