fix: import path should be github.com/ooni/probe-cli/v3 (#200)

See https://github.com/ooni/probe/issues/1335#issuecomment-771499511

cmd/ooniprobe/internal/cli/app/app.go

@@ -0,0 +1,20 @@
+package app
+
+import (
+	"os"
+
+	"github.com/apex/log"
+	"github.com/ooni/probe-cli/v3/cmd/ooniprobe/internal/cli/root"
+	"github.com/ooni/probe-cli/v3/cmd/ooniprobe/internal/version"
+)
+
+// Run the app. This is the main app entry point
+func Run() {
+	root.Cmd.Version(version.Version)
+	_, err := root.Cmd.Parse(os.Args[1:])
+	if err != nil {
+		log.WithError(err).Error("failure in main command")
+		os.Exit(2)
+	}
+	return
+}