Add pull request template

Signed-off-by: Yuki Okushi <jtitor@2k36.org>

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,10 @@
+Thanks for considering submitting a PR!
+
+Here's a checklist for things that will be checked during review or continuous integration.
+
+- \[ ] Edit corresponding file(s) under `libc-test/semver` when you add/remove item(s)
+- \[ ] `rustc ci/style.rs && ./style src`
+- \[ ] `cd libc-test && cargo test` (This might fail on your env due to environment difference between your env and CI. Ignore failures if you are not sure.)
+- \[ ] Your PR that bumps up the crate version doesn't contain any other changes
+
+Delete this line and everything above before opening your PR.

CONTRIBUTING.md

@@ -86,7 +86,7 @@ it. If you'd like to get a release out ASAP you can follow these steps:
 1. Increment the patch version number in `Cargo.toml` and `libc-test/Cargo.toml`.
 1. Send a PR to this repository. It should [look like this][example-pr], but it'd
    also be nice to fill out the description with a small rationale for the
-   release (any rationale is ok though!)
+   release (any rationale is ok though!).
 1. Once merged, the release will be tagged and published by one of the libc crate
    maintainers.