Add functionality to delete a watcher from an issue

Signed-off-by: Graham Weldon <graham@grahamweldon.com>

Author: predominant

atlassian/jira.py

@@ -963,6 +963,21 @@ def issue_add_watcher(self, issue_key, user):
             data=data,
         )
 
+    def issue_delete_watcher(self, issue_key, user):
+        """
+        Stop watching issue
+        :param issue_key:
+        :param user:
+        :return:
+        """
+        log.warning('Deleting user {user} from "{issue_key}" watchers'.format(issue_key=issue_key, user=user))
+        data = user
+        base_url = self.resource_url("issue")
+        return self.delete(
+            "{base_url}/{issue_key}/watchers".format(base_url=base_url, issue_key=issue_key),
+            data=data,
+        )
+
     def assign_issue(self, issue, account_id=None):
         """Assign an issue to a user. None will set it to unassigned. -1 will set it to Automatic.
         :param issue: the issue ID or key to assign