.readthedocs.yml: use ditaa instead of plantweb

use ditaa to reader ditaa images instead of relying plantweb service.
more stable this way.

Signed-off-by: Kefu Chai <kchai@redhat.com>

diff --git a/.readthedocs.yml b/.readthedocs.yml
index 4ac308403b5aea34ccc6a9b505776cfa6fd38980..ce7de68ae37684e858eabc2a5fb336c3573f4f24 100644 (file)
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -6,6 +6,8 @@ version: 2
 formats: []
 build:
   image: latest
+  apt_packages:
+    - ditaa
 python:
   version: 3.8
   install: