Prep for v0.13.1

Update PR template (trunk-rs#218)

Update wasm-opt invocation defaults for debug builds

Fix a few broken links in README

Prep for v0.11.0 release.

Merge pull request trunk-rs#144 from thedodd/remove-indicatif

Remove indicatif & use basic tracing for logs.

Merge pull request trunk-rs#143 from thedodd/fix-error-output

Fix error output

Fix a bug which may lead to build loops.

All dep versions are g2g. Time to release v0.9.0.

Prep for v0.8.3 release.