Can't use absinthe_phoenix with absinthe v1.6.0

[ramyma]

After upgrading absinthe to v1.6.0 I get this error:

Failed to use "absinthe" (version 1.6.0) because
  absinthe_phoenix (version 2.0.0) requires ~> 1.5.0

[dolfinus]

Fixed in #81, but version hasn't been released yet.

[dolfinus]

I've created #82