test(pymarkdown): disable line-length check for now

We overflow in api-and-naming.md's table, and there's no option to
disable this check (yet?) in PyMarkdown 0.9.6.

https://github.com/jackdewinter/pymarkdown/blob/9e4813ba4ba9923330f4682e925cf3149848ccf4/docs/rules/rule_md013.md

Author: scop

.pymarkdown.json

@@ -4,6 +4,10 @@
             "//": "Does not work with GitHub issue templates",
             "enabled": false
         },
+        "line-length": {
+            "//": "Disabled because necessary for tables, and no option to disable for them as of 0.9.6",
+            "enabled": false
+        },
         "no-inline-html": {
             "//": "https://github.com/jackdewinter/pymarkdown/issues/22",
             "enabled": false,