Added
* Clarify that `Approve` and `Reject` always exit in the documentation. ([660](https://github.com/algorand/pyteal/pull/660))
* Added frame pointer support for router. ([600](https://github.com/algorand/pyteal/pull/600))
* NOTE: a backwards incompatable change was imposed in this PR: previous `build_program` method in `Router` was exported and public, now this method is hidden. Use `compile_program` only.
* Experimental source mapping capability. ([650](https://github.com/algorand/pyteal/pull/650))
Changed
* Enable source maps using the new `FeatureGate` class. See `examples/applications/sourcemap.py` for a usage example. ([687](https://github.com/algorand/pyteal/pull/687))