run irctest in travis

.gitmodules

+[submodule "irctest"]
+	path = irctest
+	url = https://github.com/oragono/irctest

.travis.yml

 language: go
 
+dist: focal
+
 go:
     - "1.15.x"
 
   - sudo sh -c 'echo 0 > /proc/sys/net/ipv6/conf/all/disable_ipv6'
 
 script:
-- make
+- make install
 - make test
 - make smoke
+- make irctest

Makefile

-.PHONY: all install build release capdefs test smoke gofmt
+.PHONY: all install build release capdefs test smoke gofmt irctest
 
 GIT_COMMIT := $(shell git rev-parse HEAD 2> /dev/null)
 
 
 gofmt:
 	./.check-gofmt.sh --fix
+
+irctest:
+	git submodule update --init
+	cd irctest && make integration

irctest

+Subproject commit 0287b837971c27ee55bc4dca95d31afc68d2aeea