Meta: update repository files

See https://github.com/whatwg/spec-factory for details.

Author: annevk

Makefile

@@ -1,3 +1,6 @@
+SHELL=/bin/bash -o pipefail
+.PHONY: local remote deploy review
+
 remote: dom.bs
 	curl https://api.csswg.org/bikeshed/ -f -F [email protected] > dom.html -F md-Text-Macro="SNAPSHOT-LINK LOCAL COPY"
 

PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,15 @@
+<!--
+Thank you for contributing to the DOM Standard! Please describe the change you are making and complete the checklist below if your change is not editorial.
+-->
+
+- [ ] At least two implementers are interested (and none opposed):
+   * …
+   * …
+- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
+   * …
+- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/master/MAINTAINERS.md#handling-pull-requests) are filed:
+   * Chrome: …
+   * Firefox: …
+   * Safari: …
+
+(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)