Merge pull request #82 from mgattozzi/pr-template

Add PR template to the repo

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,12 @@
+Make sure these boxes are checked! 📦✅
+
+- [ ] You have the latest version of `rustfmt` installed and have your 
+      cloned directory set to nightly
+```bash
+$ rustup override set nightly
+$ rustup component add rustfmt-preview --toolchain nightly
+```
+- [ ] You ran `rustfmt` on the code base before submitting
+- [ ] You reference which issue is being closed in the PR text
+
+✨✨ 😄 Thanks so much for contributing to wasm-pack! 😄 ✨✨