Brush all the lint off this code I wrote in a haze

internal/run/upgrade.go

@@ -4,21 +4,24 @@ import (
 	"os"
 )
 
+// Upgrade is a step in a helm Plan that calls `helm upgrade`.
 type Upgrade struct {
 	Chart   string
 	Release string
 	cmd     cmd
 }
 
+// Run launches the command.
 func (u *Upgrade) Run() error {
 	return u.cmd.Run()
 }
 
+// NewUpgrade creates a new Upgrade.
 func NewUpgrade(release, chart string) *Upgrade {
 	u := Upgrade{
 		Chart:   chart,
 		Release: release,
-		cmd:     Command(HELM_BIN, "upgrade", "--install", release, chart),
+		cmd:     command(helmBin, "upgrade", "--install", release, chart),
 	}
 
 	u.cmd.Stdout(os.Stdout)