Prepare v0.8.0 release

[juntyr]

Update CHANGELOG, README, Cargo.toml, and src/lib.rs for the v0.8.0 release.

• I've included my change in CHANGELOG.md

[juntyr]

@torkleyy @kvark I've created this draft PR to update ron to v0.8.0 - since this would be my first release PR I have no idea if I've done this correctly. Essentially I've just created a new v0.8 branch from main and written a PR for it which bumps every mention of 0.7 to 0.8. Does that look correct? I've given the release the tentative date of this Wednesday, August 17th.

[codecov-commenter]

Codecov Report

Merging #398 (3722636) into v0.8 (172bdd6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             v0.8     #398   +/-   ##
=======================================
  Coverage   86.55%   86.55%           
=======================================
  Files          49       49           
  Lines        5803     5803           
=======================================
  Hits         5023     5023           
  Misses        780      780           

Impacted Files	Coverage Δ
src/lib.rs	100.00% <ø> (ø)

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[torkleyy]

Looks good to me, we just need to make sure to merge these changes into master as well. In this case I wouldn't even create a branch and target master directly since we release from master. (the branch can be created afterwards if needed, from the tag)

[juntyr]

@torkleyy Ok, it's now targeting the main branch. Since you have the permissions to create the GitHub release and release to crates.io, you can merge the PR anytime you want (and if you'd like me to update the release date beforehand, I should be able to do that within a few minutes).