live_motion doesn't compile when added to a new Phoenix project

[mrluc]

It wants phoenix_html v3.x, when current Phoenix uses v4.

You can of course override: true the phoenix_html dependency, to fix it at v4 and get past that dependency issue.

But then attempting to compile gives:

iex -S mix phx.server
Erlang/OTP 27 [erts-15.0] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [jit]

==> live_motion
Compiling 6 files (.ex)

== Compilation error in file lib/live_motion.ex ==
** (CompileError) lib/live_motion.ex:237: invalid options [default: nil] for slot :inner_block. The supported options are: [:required, :doc, :validate_attrs]
    (phoenix_live_view 1.0.0-rc.7) lib/phoenix_component/declarative.ex:556: Phoenix.Component.Declarative.compile_error!/3
    (phoenix_live_view 1.0.0-rc.7) lib/phoenix_component/declarative.ex:274: Phoenix.Component.Declarative.__slot__!/6
    lib/live_motion.ex:237: (module)
could not compile dependency :live_motion, "mix compile" failed. Errors may have been logged above. You can recompile this dependency with "mix deps.compile live_motion --force", update it with "mix deps.update live_motion" or clean it with "mix deps.clean live_motion"

In my testing, removing the , default: nil in lib/live_motion.ex:237 fixes that