0.10.3 release

Dependency updates 20230104 (#276)

* Bump actions/cache from 2.1.6 to 3.2.2
* Bump codecov/codecov-action from 1.5.0 to 3.1.1
* Bump erlef/setup-elixir from 1.7 to 1.15
* Bump actions/checkout from 2.3.4 to 3.2.0
* Bump excoveralls from 0.14.1 to 0.15.1
* Bump dialyxir from 1.1.0 to 1.2.0
* Bump ex_doc 0.24.2 => 0.29.1 (minor), earmark_parser 1.4.13 => 1.4.29, makeup 1.0.5 => 1.1.0, makeup_elixir 0.15.1 => 0.16.0 (minor), nimble_parsec 1.1.0 => 1.2.3
* Bump credo 1.5.6 => 1.6.7, bunt 0.2.0 => 0.2.1
* Bump timex 3.7.5 => 3.7.9, gettext 0.18.2 => 0.20.0 (minor), tzdata 1.1.0 => 1.1.1
* set-output is deprecated, use env "files"
* bump Erlang/OTP and Elixir versions for CI
* address credo warnings
* map_join is more efficient than `map |> join`
* fixed typespecs in test helper
* remove deprecated Mix.Config usage
* version 0.10.2
* add missing tests for string builder
* Update CHANGELOG.md
* use README for docs landing
* remove broken image

Merge pull request #203 from peek-travel/hotfix/fix-infinite-loop

Infinite loop possible if "end time" is within "duration" of midnight

Merge pull request #183 from peek-travel/release/0.10.0

Prepearing for release 0.10.0

prepare for 0.9 release

Require Elixir 1.7

Update version and changelog for release

Bump version and update changelog for new release.

Merge pull request #38 from peek-travel/backwards-compat-bytime

Allow backwards compatible parsing of BYTIME rules

update changelog for release