Update client.py (pycontribs#1005)

Chance made to solve error:

    c.a.p.r.c.security.jersey.XsrfResourceFilter] Use of the 'nocheck' value for X-Atlassian-Token has been deprecated since rest 3.0.0. Please use a value of 'no-check' instead.

Author: EdgeSync

jira/client.py

@@ -887,7 +887,7 @@ def add_attachment(self, issue, attachment, filename=None):
                 url,
                 files={"file": (fname, attachment, "application/octet-stream")},
                 headers=CaseInsensitiveDict(
-                    {"content-type": None, "X-Atlassian-Token": "nocheck"}
+                    {"content-type": None, "X-Atlassian-Token": "no-check"}
                 ),
             )
         else:
@@ -907,7 +907,7 @@ def file_stream():
                 url,
                 data=m,
                 headers=CaseInsensitiveDict(
-                    {"content-type": m.content_type, "X-Atlassian-Token": "nocheck"}
+                    {"content-type": m.content_type, "X-Atlassian-Token": "no-check"}
                 ),
                 retry_data=file_stream,
             )