Mention regression issue template

Author: camelid

posts/inside-rust/2020-10-08-regression-labels.md

@@ -35,6 +35,10 @@ regression and it will automatically be prioritized:
 Just replace `{release-channel}` with one of `nightly`, `beta`, or `stable`,
 depending on when the regression occurred, and you're good to go!
 
+Alternatively, if you are reporting a new regression, you can use the regression
+[issue template]. It will guide you through the process of reporting a
+regression and providing information that will help us fix the issue.
+
 Finally, if you have an issue that is *not* a regression, but is still something
 that is important to be fixed, you can request prioritization with:
 
@@ -46,3 +50,4 @@ so we can track them and fix them as soon as possible!
 [rustbot-labeling-docs]: https://rustc-dev-guide.rust-lang.org/rustbot.html#issue-relabeling
 [internals-thread]: https://internals.rust-lang.org/t/1-46-is-unusable-for-me-solved/13161/10
 [regression-label-pr]: https://github.com/rust-lang/rust/pull/77555
+[issue template]: https://github.com/rust-lang/rust/issues/new/choose