0.1.18

What's Changed

• benchmark: fail testsuite if they become slower; make it easier to see reports by @skshetry in #128
• hash_info: use attrs slotted class by @skshetry in #129
• Fix pypy run by @skshetry in #130
• meta: use attrs by @skshetry in #131
• diff: use attrs by @skshetry in #132

Full Changelog: 0.1.17...0.1.18