Fix build support for previous Stack LTS versions and drop those no longer supported #126
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This gets older stackage snapshots building by including attoparsec-aeson as an extra dependency. Notably any project that wants to use the new version of hal but an older snapshot will have to do the same. Given that most users will likely move both simultaneously, this seems like an acceptable trade-off for greater compatibility in other areas.
While attoparsec-aeson absolutely could relax their bounds to support LTS 11 and 12, they have inexplicably refused to do so. Without this, there aren't many good options on the table, so for the moment, we're going to drop support for 11 and 12 for this version forward.