Initial implementation of nestable test API

Author: craigfe

Makefile

@@ -3,6 +3,10 @@
 all:
 	dune build
 
+doc:
+	dune build @doc --force
+	cp -r _build/default/_doc/_html doc/static/api
+
 test:
 	dune runtest
 

alcotest-async.opam

@@ -9,7 +9,7 @@ homepage: "https://github.com/mirage/alcotest"
 doc: "https://mirage.github.io/alcotest"
 bug-reports: "https://github.com/mirage/alcotest/issues"
 depends: [
-  "dune" {>= "2.2"}
+  "dune" {>= "2.4"}
   "re" {with-test}
   "fmt" {with-test}
   "cmdliner" {with-test}