0.17.0

What's Changed

• Merge to master changes addressed to the MongooseIM by @Premwoik in #1
• Set default value when null is passed explicitly by @jacekwegr in #2
• Fix typo in graphql_check by @kamilwaz in #3
• Enable unknown types warnings by @arcusfelis in #4
• Make geas a project plugin by @arcusfelis in #5
• Prepare to release new hex packages by @NelsonVides in #6

Full Changelog: 0.16.1...0.17.0