Release 0.6.3 (cljdoc-renderable)
v0.6.2 published to Clojars cleanly but cljdoc rejected the doc tree
because children in doc/cljdoc.edn were wrapped in an extra vector.
Per cljdoc's grammar, children are inline siblings of the parent,
not nested in a wrapping vector. Fixed and bumped to 0.6.3.