v0.9.0

What's Changed

• sweep: a loop frees what a list holds, can fail part way, and empties the list only after it by @kmoneil in #77
• unlock: a lock taken, then something that can fail before the unlock, with no defer by @kmoneil in #78
• wipe: a local wiped with @Memset as the last thing done with it, a dead store release builds drop by @kmoneil in #79
• release: 0.9.0 by @kmoneil in #80

Full Changelog: v0.8.0...v0.9.0