use Plex Server 1.10.1 for testing agains oldest version

Author: worried-networking

.travis.yml

@@ -56,7 +56,7 @@ jobs:
     - stage: test
       python: 3.6
       env:
-        - PLEX_CONTAINER_TAG=1.9.7.4460-a39b25852
+        - PLEX_CONTAINER_TAG=1.10.1.4602-f54242b6b
         - TEST_ACCOUNT_ONCE=1
     - stage: test
       python: 3.6