MD007 shouldn't apply to sublists of ordered lists, test and document MD006 behavior (fixes #20).

test/lists-with-nesting.md

@@ -0,0 +1,73 @@
+# Heading
+
+## Excessive nesting
+
+- one
+   1. two
+   1. three
+- four
+
+1. one
+    - two
+    - three
+1. four
+
+## Insufficient nesting
+
+- one
+ 1. two
+ 1. three
+- four
+
+1. one
+  - two {MD006}
+  - three
+1. four
+
+## Correct nesting, same type
+
+- one
+  - two
+  - three
+- four
+
+1. one
+   1. two
+   1. three
+1. four
+
+## Correct nesting, different types
+
+- one
+  1. two
+  1. three
+- four
+
+1. one
+   - two
+   - three
+1. four
+
+1. one
+   - two
+     - three
+
+- one
+  1. two
+     - three
+
+- one
+  - two
+    1. three
+
+1. one
+   1. two
+      - three
+
+1. one
+   - two
+     1. three
+
+- one
+  1. two
+     1. three