Equinox v0.5.5

Autogenerated release notes as follows:

What's Changed

• Fix doc typo by @patrick-kidger in #130
• Updated pooling docs with init and call by @patrick-kidger in #131
• Doc fix by @patrick-kidger in #132
• Tidied helper into a relative import by @patrick-kidger in #133
• minor bug fix by @patrick-kidger in #134

Full Changelog: v0.5.4...v0.5.5