0.7.0

What's Changed

• typos by @richardkiss in #393
• Support backref for wasm by @ChiaMineJP in #395
• bump CI to use python 3.8 by @arvidn in #400
• pass in allocator to post-eval callback by @arvidn in #399
• bump version to 0.7.0 by @arvidn in #401

Full Changelog: 0.6.1...0.7.0