0.0.21

What's Changed

• Add write_ivecs and write_fvecs utils by @jparismorgan in #189
• Add support for randomly sampling the input data to compute centroids with by @jparismorgan in #183
• Small improvements to test instructions by @jparismorgan in #192
• Use sklearn as default for kmeans until the C++ kmeans library is released in Docker images by @NikolaosPapailiou in #194

Full Changelog: 0.0.20...0.0.21