Switch CI to an older nightly for now, fix templates a bit

.github/ISSUE_TEMPLATE/bug_report.md

@@ -7,8 +7,8 @@ assignees: ''
 
 ---
 
-<! Thank you for filing this! Please read the [debugging tips](https://github.com/gfx-rs/wgpu/wiki/Debbugging-wgpu-Applications).
+<!-- Thank you for filing this! Please read the [debugging tips](https://github.com/gfx-rs/wgpu/wiki/Debbugging-wgpu-Applications).
-That may let you investigate on your own, or provide additional information that helps us to assist.>
+That may let you investigate on your own, or provide additional information that helps us to assist.-->
 
 **Description**
 A clear and concise description of what the bug is.

.github/pull_request_template.md

@@ -0,0 +1,17 @@
+**Connections**
+_Link to the issues addressed by this PR, or dependent PRs in other repositories_
+
+**Description**
+_Describe what problem this is solving, and how it's solved._
+
+**Testing**
+_Explain how this change is tested._
+<!--
+Non-trivial functional changes would need to be tested through:
+  - [wgpu-rs](https://github.com/gfx-rs/wgpu-rs) - test the examples.
+  - [wgpu-native](https://github.com/gfx-rs/wgpu-native/) - check the generated C header for sanity.
+
+Ideally, a PR needs to link to the draft PRs in these projects with relevant modifications.
+See https://github.com/gfx-rs/wgpu/pull/666 for an example.
+If you can add a unit/integration test here in `wgpu`, that would be best.
+-->

.github/workflows/ci.yml

@@ -96,7 +96,8 @@ jobs:
         name: Install latest nightly
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: nightly
+          # temporary due to https://github.com/rust-lang/rust/issues/72467
+          toolchain: nightly-2020-05-01
           override: true
       - if: matrix.channel == 'stable'
         run: rustup component add clippy