Support deleting contacts

Fixes #16 (closed)

briar_wrapper/models/contacts.py

@@ -8,6 +8,7 @@ Wrapper around Briar API's _/contacts/_ resource
 from operator import itemgetter
 from urllib.parse import urljoin
 
+from requests import delete as _delete
 from requests import get as _get
 from requests import post as _post
 
@@ -35,6 +36,19 @@ class Contacts(Model):
         url = urljoin(BASE_HTTP_URL, self._API_ENDPOINT + "add/pending/")
         _post(url, headers=self._headers, json={"link": link, "alias": alias})
 
+    def delete(self, contact_id):
+        # pylint: disable=line-too-long
+        """
+
+        Deletes the contact with `contact_id`
+
+        [Upstream documentation](https://code.briarproject.org/briar/briar/blob/master/briar-headless/README.md#removing-a-contact)
+
+        .. versionadded:: 0.0.4
+        """
+        url = urljoin(BASE_HTTP_URL, self._API_ENDPOINT + str(contact_id))
+        _delete(url, headers=self._headers)
+
     def get(self):
         # pylint: disable=line-too-long
         """