Merge remote-tracking branch 'origin/master' into alpn-alt-svc

Author: MikeBishop

Makefile

@@ -7,3 +7,6 @@ ifneq (,$(shell git submodule status lib 2>/dev/null))
 else
 	git clone -q --depth 10 -b master https://github.com/martinthomson/i-d-template.git lib
 endif
+
+latest::
+	@if grep -l ' $$' *.md; then ! echo "Trailing whitespace found"; fi