Added gosimple

Moved steps before actual `go test` in the before_script section
so that build fails early in case of errors found by staticcheck
and the like.

.travis.yml

@@ -9,10 +9,13 @@ install:
 - go get github.com/mattn/goveralls
 - go get github.com/wadey/gocovmerge
 - go get honnef.co/go/tools/cmd/staticcheck
-script:
+- go get honnef.co/go/tools/cmd/gosimple
+before_script:
 - go fmt ./...
 - go vet ./...
+- gosimple ./...
 - staticcheck ./...
+script:
 - go test -i -race ./...
 - go test -v -race ./...
 after_success:

stan_test.go

@@ -83,7 +83,7 @@ func stackFatalf(t tLogger, f string, args ...interface{}) {
 	// Generate the Stack of callers:
 	for i := 1; true; i++ {
 		_, file, line, ok := runtime.Caller(i)
-		if ok == false {
+		if !ok {
 			break
 		}
 		msg := fmt.Sprintf("%d - %s:%d", i, file, line)
@@ -677,7 +677,7 @@ func TestSubscriptionStartAtTime(t *testing.T) {
 	}
 
 	// Now test Ago helper
-	delta := time.Now().Sub(startTime)
+	delta := time.Since(startTime)
 
 	sub, err = sc.Subscribe("foo", mcb, StartAtTimeDelta(delta))
 	if err != nil {