Switch to Prometheus' collectors package

Address a report by staticcheck: prometheus.[…] is deprecated: Use
collectors.[…] instead. (SA1019)

Author: hansmi

main.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/kballard/go-shellquote"
 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/collectors"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/prometheus/common/version"
 	"github.com/prometheus/exporter-toolkit/web"
@@ -44,9 +45,9 @@ func main() {
 
 	if !*disableExporterMetrics {
 		registry.MustRegister(
-			prometheus.NewBuildInfoCollector(),
-			prometheus.NewProcessCollector(prometheus.ProcessCollectorOpts{}),
-			prometheus.NewGoCollector(),
+			collectors.NewBuildInfoCollector(),
+			collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}),
+			collectors.NewGoCollector(),
 			version.NewCollector("lvm_exporter"),
 		)
 	}