- update to 2.21.1:
  * Fix numerical precision issues for small-gradient L-BFGS
    scaling factor computations (#392).
  * Ensure the tests are built with optimisation enabled
  * Clarify return values for different callback types
  * Fix return types of callbacks
  * Minor cleanup for printing optimization reports via
    `Report()`

  * Avoid deprecation warnings in Armadillo 11.2+
- Update to version 2.12.1

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- update to 2.19.1:
  * Avoid deprecation warnings in Armadillo 11.2+

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- update to 2.19.0:
  * Added DemonSGD and DemonAdam optimizers
  * Fix bug with Adam-like optimizers not resetting when `resetPolicy` is `true`.
  * Add Yogi optimizer
  * Add AdaBelief optimizer
  * Add AdaSqrt optimizer
  * Bump check for minimum supported version of Armadillo
  * Update Catch2 to 2.13.8
  * Fix epoch timing output
  * Accelerate SGD test time
  * Fix potential infinite loop in CMAES
  * Fix SCD partial gradient test
  * Add gradient value clipping and gradient norm scaling callback
  * Remove superfluous CMake option to build the tests
  * Bump minimum Armadillo version to 9.800
  * Update Catch2 to 2.13.7
  * Remove redundant template argument for C++20 compatibility
  * Fix MOEAD test stability

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- Update to 2.16.2
  * See: https://ensmallen.org/docs.html#ensmallen-2162-severely-dented-can-of-polyurethane
  * and skipped 2.16.1: https://ensmallen.org/docs.html#ensmallen-2161-severely-dented-can-of-polyurethane

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