FIX/CLN: remove unsupported power_expression

[klauer]

Closes #75

[codecov-commenter]

Codecov Report

Merging #76 (a522ef5) into master (11d5c30) will increase coverage by 0.2%. The diff coverage is n/a.

Additional details and impacted files

[](https://app.codecov.io/gh/klauer/blark/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=K+Lauer) ```diff @@ Coverage Diff @@ ## master #76 +/- ## ======================================== + Coverage 78.1% 78.3% +0.2% ======================================== Files 26 26 Lines 5339 5339 ======================================== + Hits 4171 4184 +13 + Misses 1168 1155 -13 ``` | [Impacted Files](https://app.codecov.io/gh/klauer/blark/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=K+Lauer) | Coverage Δ | | |---|---|---| | [blark/tests/test\_transformer.py](https://app.codecov.io/gh/klauer/blark/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=K+Lauer#diff-YmxhcmsvdGVzdHMvdGVzdF90cmFuc2Zvcm1lci5weQ==) | `93.1% <ø> (ø)` | | | [blark/transform.py](https://app.codecov.io/gh/klauer/blark/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=K+Lauer#diff-YmxhcmsvdHJhbnNmb3JtLnB5) | `98.9% <ø> (ø)` | | ... and [2 files with indirect coverage changes](https://app.codecov.io/gh/klauer/blark/pull/76/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=K+Lauer)