go1.17 support

Stack traces from go1.17 runtime are now supported!

What's Changed

• Correct fish shell usage documentation by @dallbee in #58
• Add //go:build lines by @nvanbenschoten in #64
• Fix misuse of unbuffered os.Signal channel as argument to signal.Notify by @nvanbenschoten in #63

New Contributors

• @dallbee made their first contribution in #58
• @nvanbenschoten made their first contribution in #64

Full Changelog: v2.1.1...v2.2.0