chore: switch to circleci

Our CircleCI scripts check builds on a ton of platforms and have better linting.

.circleci/config.yml

+version: 2.1
+orbs:
+  ci-go: ipfs/ci-go@0.2
+
+workflows:
+  version: 2
+  test:
+    jobs:
+      - ci-go/build
+      - ci-go/lint
+      - ci-go/test

.travis.yml

-language: go
-
-go:
-- 1.13.x
-
-os:
-  - linux
-  - osx
-  - windows
-
-jobs:
-  fast_finish: true
-
-script:
-  - go test -v -race .

netroute_test.go

@@ -20,6 +20,9 @@ func TestRoute(t *testing.T) {
 	var localAddr net.IP
 	var hasV6 bool
 	addrs, err := ifs[0].Addrs()
+	if err != nil {
+		t.Fatal(err)
+	}
 	for _, addr := range addrs {
 		if strings.HasPrefix(addr.Network(), "ip") {
 			localAddr, _, _ = net.ParseCIDR(addr.String())