Make abi3 a default Cargo feature

Author: hombit

CHANGELOG.md

@@ -13,9 +13,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
-- Stop publishing PyPy wheels to PyPI. We still publish all CPython wheels we published previously https://github.com/light-curve/light-curve-python/issues/345 https://github.com/light-curve/light-curve-python/pull/347
+- Stop publishing PyPy wheels to PyPI. We still publish all CPython wheels we published
+  previously https://github.com/light-curve/light-curve-python/issues/345 https://github.com/light-curve/light-curve-python/pull/347
 - Bump `pyO3` to 0.21
 - Bump `rust-numpy` to 0.21
+- "abi3" is a default Cargo feature now
 
 ### Deprecated
 

light-curve/Cargo.lock

@@ -18,7 +18,7 @@ lto = true
 codegen-units = 1
 
 [features]
-default = ["ceres-source", "fftw-source", "gsl", "mimalloc"]
+default = ["abi3", "ceres-source", "fftw-source", "gsl", "mimalloc"]
 abi3 = ["pyo3/abi3-py38"]
 ceres-source = ["light-curve-feature/ceres-source"]
 ceres-system = ["light-curve-feature/ceres-system"]