Updating conduit and resourcet upper bounds

Updates `conduit` and `resourcet` upper bounds to a new, safe, maximum of `1.2`.

Despite the API of `conduit >= 1.1` in particular containing a number of breaking changes - none of the internals of this library needed to be updated.

The tests pass with the introduction of `resourcet`, as `Data.Conduit` no longer exports `runResourceT`.

The version number of this library has also been bumped to `1.1.0`.