Dropped Erlang 19 due to kerl crypto issue.

Added newer rebar3 for CI/CD.

Bumped version for next release.

Bumped version for new community contributions.

Bumped to version 1.3.

Bumped to the next micro version.

Includes several bug fixes (last 5 or 6 commits since previous bug-fix
release).

Updated ignores.

Merge branch 'master' of git://github.com/ivanos/erlang_iso8601 into …

…ivanos-master

Conflicts:
	src/iso8601.erl

Bumped version to 1.2.

Bump version for bugfix release