Bump to 0.2.70 (#2435)

Changes:

• b6355c2 Bump to 0.2.70 (#2435)
• 906fa91 Fix typo (#2431)
• 0049fa5 Update WebIDL to use undefined instead of void (#2427)
• 544bfa3 Add WebIDL items DisplayMediaStreamConstraints and getDisplayMedia (#2423)
• ffa3e93 Remove reference to nightly Rust for now stabilised feature. (#2420)
• 7465a4f Fix typo in comment (#2415)
• b2fe5d1 Convert async iterators to streams (#2401)
• 9f725e7 Try to fix CI
• c195746 Allow constructors to be immutable and add it for ImageData (#2400)
• 9d80e7d Fix canvas is not a self closing tag. (#2408)

See More

• b79f5b2 Add documentation for importing export default (#2403)
• d6825ad Handle Expr::Group in the macro parser (#2395) [ #2393 ]
• b584407 Don't emit mutable globals (#2391)
• d6d222c Update html_root_url to point to version 0.3 (#2390)
• 7702823 Adjust Bluetooth IDL for Rust (#2385)
• a125903 Update lazy_static dependency to "1.0.2" (#2378)

This list of changes was auto generated.