[ENH] Moves epsilo offset logic to TruncatedDistribution from Hurdle

[tingiskhan]

Reference Issues/PRs

Fixes #566.

What does this implement/fix? Explain your changes.

Moves the epsilon offset logic for the Hurdle distribution to Truncated instead.

Does your contribution introduce a new dependency? If yes, which one?

No.

What should a reviewer concentrate their feedback on?

Did you add any tests for the change?

No.

Any other comments?

The tests pass locally, so I'm hoping this solves the issues.

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[fkiraly]

This seems to work!