Release 2021.9.0

Author: sssilver

RELEASE_NOTES

@@ -1,3 +1,16 @@
+2021.9.0
+- 2021-09-02 Fix broken TryCloudflare link
+- 2021-09-03 Add support for taking named tunnel credentials from an environment variable
+- 2021-08-30 TUN-5012: Use patched go-sumtype
+- 2021-08-31 TUN-5011: Use the region parameter in fallback SRV lookup
+- 2021-08-31 TUN-5029: Do not strip cf- prefixed headers
+- 2021-08-29 TUN-5009: Updated github action to use go 1.17.x for checks
+- 2021-08-28 TUN-5010: --region should be a string flag
+- 2021-08-10 Allow building on arm64 platforms
+- 2021-06-09 Update README.md
+- 2021-05-31 🖌️ Allow providing TokenID and TokenSecret as env vars when calling cloudflared access
+- 2021-05-31 🎨 Prefix env var parameters with TUNNEL
+
 2021.8.7
 - 2021-08-28 Revert "TUN-4926: Implement --region configuration option"