Merge pull request 'feature/add-update-attachment' (#1) from feature/add-update-attachment into master

Reviewed-on: #1

Bookstack.py

@@ -62,6 +62,22 @@ def get_attachment(wiki_url, token_id, token_secret, attachment_id):
     return attachment_data_decoded
 
 
+def update_attachment(wiki_url, token_id, token_secret, attachment_id, file_name, file_data, page_id):
+    headers = {}
+    headers.update(get_auth_header(token_id, token_secret))
+
+    data = {}
+    # Workaround for updating files: https://github.com/BookStackApp/BookStack/issues/3666
+    data["_method"] = "PUT"
+    data["name"] = file_name
+    data["uploaded_to"] = page_id
+
+    files = {}
+    files["file"] = file_data
+
+    requests.post(wiki_url + "/api/attachments/{}".format(attachment_id), headers=headers, data=data, files=files)
+
+
 def delete_attachment(wiki_url, token_id, token_secret, attachment_id):
     headers = {}
     headers.update(get_auth_header(token_id, token_secret))