<commit_before># Revision history for CIlib

## [2.1.0]

This release replaces some of the internal library code with zio and
zio-prelude libraries. The changes are not fundamental and have
allowed for some simplifications to some of the types within the
library.

Notable changes include:

- `zio`, `zio-stream` and `zio-prelude` are new dependencies,
  replacing `scalaz` and `scalaz-stream`/`fs2`.
- The dependency on monocle has been removed to reduce the size of
  transitive dependencies.
- `RVar`, `Step` and `StepS` data types have been simplified, with a
  type parameter being removed from both `Step` and `StepS`.
- Scala 2.11 is no longer supported.
- Preparation for Scala 3.0.0 as a new compilation target (currently
  blocked due to depenencies needing to upgrade frist e.g. spire)
- The heterogeneous PSO has been removed in favour of a new, far
  simpler implementation.
- Data types now have variance annotations where relevant, allowing
  for better error messages from the compiler and aids in the
  simplification of types (e.g. the `Eval` instances).<commit_msg>Update CHANGELOG.md<commit_after># Revision history for CIlib

## [2.1.0]

This release replaces some of the internal library code with zio and
zio-prelude libraries. The changes are not fundamental and have
allowed for some simplifications to some of the types within the
library.

Notable changes include:

- `zio`, `zio-stream` and `zio-prelude` are new dependencies,
  replacing `scalaz` and `scalaz-stream`/`fs2`.
- The dependency on `monocle` has been removed to reduce the size of
  transitive dependencies.
- `RVar`, `Step` and `StepS` data types have been simplified, with a
  type parameter being removed from both `Step` and `StepS`.
- Scala 2.11 is no longer supported.
- Preparation for Scala 3.0.0 as a new compilation target (currently
  blocked due to depenencies needing to upgrade frist e.g. spire)
- The heterogeneous PSO has been removed in favour of a new, far
  simpler implementation.
- Data types now have variance annotations where relevant, allowing
  for better error messages from the compiler, aiding in the
  simplification of types (e.g. the `Eval` instances).
- The `cilib.Environment` type has been removed and values are now
  just used directly (the indirection has now been reduced).
- Removed the `refined` library in favour of using `newtype`s from
  `zio-prelude`.
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