Replace Mix dependency :poison by :jason

[redrabbit]

A lot of Hex packages (Phoenix and Ecto to name the bigger ones) requiring JSON encoding/decoding have moved to :jason lately.

This PR is a pure replacement, an other possibility would be make the JSON decoder configurable.

[mroth]

Hi, thanks for the contribution! It looks like this is failing tests in Travis CI on version of Elixir < 1.3.0. I'm guessing most folks have moved off those older versions by now?

If so, the travis file can be adjusted to remove those tests, however a new constraint should then be added to this module indicating the minimum version of Elixir required. Thoughts?

[redrabbit]

I've updated .travis.yml to use Elixir versions from 1.4 to 1.10 with appropriate OTP versions.

[mroth]

Thanks so much!

[redrabbit]

It would be nice to have a newer version published on Hex 😄.

[mroth]

@redrabbit it's been a long while since I've published anything via Hex (I dont actually even have Elixir toolchain on my workstation at the moment). Do you know if there is a decent GitHub Action to automate publishing? That way it would be easier to have releases be community maintained. I did find this one but it doesnt have many stars currently: https://github.com/marketplace/actions/publish-to-hex

[redrabbit]

Hi @mroth, I'm not really familiar with GH actions. The publish-to-hex action you are referring to seems to do the job.

As a maintainer myself I would not want to have package publication as part of my CI for various reasons. When I release a new version, I have a few steps to do manually.

• Bump version number in one or multiple files.
• Add changes to CHANGELOG.
• Add new Git tag.
• Deploy/publish package.

After researching for a while, I stumbled across this older comment from @ericmj (author of Hex) who addresses a similar issue.

[mroth]

@redrabbit gotcha. I have a number of those things automated in my other repos (often using https://github.com/mroth/bump), but I'll try to just cut the release to Hex manually here in a docker container for now.