New features
* Hafnian library has been renamed to The Walrus, and the low-level libhafnian C++ library renamed to `libwalrus`. [34](https://github.com/XanaduAI/thewalrus/pull/34)
* Added a seed function `thewalrus.samples.seed`, in order to make the sampling algorithms deterministic for testing purposes. [29](https://github.com/XanaduAI/thewalrus/pull/29)
* Added support for the batched hafnian; `hafnian_batched` (in Python) and `libwalrus::hermite_multidimensional_cpp` (in C++). This is a newly added algorithm that allows a batch of photon number statistics to be computed for a given quantum Gaussian state. [21](https://github.com/XanaduAI/thewalrus/pull/21)
* Adds the ability to sample from Gaussian states with finite means. [25](https://github.com/XanaduAI/thewalrus/pull/25)
Improvements
* Permanent Fortran code was ported to C++, with improvements including support for quadruple precision and summation using the `fsum` algorithm. [20](https://github.com/XanaduAI/thewalrus/pull/20)
* Reorganization of the repository structure; C++ source code folder has been renamed from `src` to `include`, C++ tests have been moved into their own top-level directory `tests`, and the `hafnian/lib` subpackage has been removed in favour of a top-level `thewalrus/libwalrus.so` module. [34](https://github.com/XanaduAI/thewalrus/pull/34)
* Added additional references to the bibliography [30](https://github.com/XanaduAI/thewalrus/pull/30)
* Adds documentation related to permanents, sampling states with nonzero displacement, sampling of classical states, and multidimensional Hermite polynomials and batched hafnians. [27](https://github.com/XanaduAI/thewalrus/pull/27)
* Simplifies the hafnian sampling functions [25](https://github.com/XanaduAI/thewalrus/pull/25)
* Test improvements, including replacing custom tolerance checks with `np.allclose()`. [23](https://github.com/XanaduAI/thewalrus/pull/23)
Bug fixes
* Minor typos corrected in the documentation. [33](https://github.com/XanaduAI/thewalrus/pull/33) [#28](https://github.com/XanaduAI/thewalrus/pull/28) [#34](https://github.com/XanaduAI/thewalrus/pull/31)
Contributors
This release contains contributions from (in alphabetical order):
Brajesh Gupt, Josh Izaac, Nicolas Quesada