rebar3 new crashes with unicode variables content

[deemytch]

rebar3 crashed with commandline below when some vars are in unicode.
Archlinux, Erlang/OTP 24 [erts-12.1.2] [source] [64-bit] [smp:12:12] [ds:12:12:10] [async-threads:1] [jit]

% rebar3 new release name="tarel" desc="Тестовая приложенька" 
===> Writing tarel/apps/tarel/src/tarel_app.erl
===> Writing tarel/apps/tarel/src/tarel_sup.erl
===> Uncaught error in rebar_core. Run with DIAGNOSTIC=1 to see stacktrace or consult rebar3.crashdump
===> When submitting a bug report, please include the output of `rebar3 report "your command"`

rebar3.diagnostic.txt
rebar3.report.txt

[ferd]

The issue is located within https://github.com/soranoba/bbmustache, specifically at https://github.com/soranoba/bbmustache/blob/7631da97b0c4de54753257e126cb6f983d0c4b83/src/bbmustache.erl#L278, where the code should likely call for unicode:characters_to_binary instead of iolist_to_binary.

Opened a sibling issue at soranoba/bbmustache#61