Log Message:
Update to 2.66. From the changelog:

2.66 2021-02-21
- from_graph not drop isolated vertices - thanks @jhannah-mm for report

2.65 2021-01-09
- undirected edges don't get doubled in from_graph, changes dot_input

2.64 2021-01-01
- fix multigraph-handling

2.63 2021-01-01
- from_graph to handle multigraphs

2.62 2020-11-16
- fix label quoting

2.61 2020-11-08
- support Perl 5.8.8

2.60 2020-11-04
- fix GraphViz2->from_graph object method
- Parse::STT add visualise modes: REs become nodes or ports for clearer
  transitions
- more robust quoting for record ports
- add handling array-ref for record ports

2.59 2020-10-31
- GraphViz2->from_graph, dep on Graph, use as intermediate in Parse::Regexp
- convert Parse::Yacc, Parse::Yapp, Parse::STT to graph-based

2.58 2020-10-19
- add combine_node_and_port global option
- add_node(label => [{port=>...}]) no need <>

2.57 2020-10-15
- drop unnecessary use of "open" and "charnames"
- setting defaults for subgraphs no longer affects outside those
- now let DOT figure out inheritance rather than respecifying everything
  in subgraphs
- fixed docs on controlling subgraph attributes

2.56 2020-10-13
- fix problem when "which" returns empty list not scalar - thanks
  @eserte for report

2.55 2020-10-13
- fix bugs in webgen scripts
- make dot_input be lazy-built
- zap undoc-ed dependency method that actually belongs in ::Parse::ISA

2.54 2020-10-09
- zap report_valid_attributes method
- drop Log::Handler, any object that can "debug" or "error" works

2.53 2020-10-09
- drop Try::Tiny

2.52 2020-10-09
- zap obsolete special case in a test/webgen for Darwin - fix #7. Thanks
  @dbevans for report!

2.51 2020-10-08
- DOT input now prettier
- tests rearranged so can run in parallel, ergo quicker
- tests now rigorously capture DOT input in each scenario
- generating web content updated, output removed from distro so smaller
- drop Set::Array

2.50 2020-10-02
- dropped 3 more unnecessary deps, metadata tweak

2.49 2020-09-27
- split out into own distro: GraphViz2::DBI, GraphViz2::Parse::XML,
  GraphViz2::Parse::ISA, GraphViz2::Data::Grapher,
  GraphViz2::Parse::RecDescent