Add test for batteries module, update deps

cmd/battery-test/main.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/davecgh/go-spew/spew"
+	"github.com/distatus/battery"
+)
+
+// Program entry point.
+func main() {
+	for {
+		batteries, err := battery.GetAll()
+
+		if err != nil {
+			fmt.Printf("Unable to get battery info: %w", err)
+		}
+
+		spew.Dump(batteries)
+		time.Sleep(1 * time.Second)
+	}
+}