fix finmax on 1.6

Author: mortenpi

src/documentertools/canonical_urls.jl

@@ -211,7 +211,9 @@ function canonical_version_from_versions_js(docs_directory)
         if isempty(version_symlinks)
             error("Unable to determine the canonical path. Found no version directories")
         end
-        _, idx = findmax(first, version_symlinks)
+        # Note: findmax(first, version_symlinks) would be nicer, but is not supported
+        # on Julia 1.6
+        _, idx = findmax(first.(version_symlinks))
         version_symlinks[idx][2]
     elseif length(non_version_symlinks) > 1
         error(