[Jira] Make get_issue_changelog start and limit work. (#1375)

* [Jira] Make get_issue_changelog start and limit work. The result will be formatted differently.

* Try to get the read the docs build working.

.readthedocs.yml

@@ -5,6 +5,11 @@
 # Required
 version: 2
 
+build:
+  os: ubuntu-lts-latest
+  tools:
+    python: "3.8"
+
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
   configuration: docs/conf.py

atlassian/jira.py

@@ -1221,13 +1221,13 @@ def get_issue_changelog(self, issue_key, start=None, limit=None):
         :return:
         """
         base_url = self.resource_url("issue")
-        url = "{base_url}/{issue_key}?expand=changelog".format(base_url=base_url, issue_key=issue_key)
+        url = "{base_url}/{issue_key}/changelog".format(base_url=base_url, issue_key=issue_key)
         params = {}
         if start:
             params["startAt"] = start
         if limit:
             params["maxResults"] = limit
-        return (self.get(url) or {}).get("changelog", params)
+        return self.get(url, params=params)
 
     def issue_add_json_worklog(self, key, worklog):
         """