Format the Lint struct non-weirdly [#3]

I thought it was a golang style convention to put a blank line between
public and private struct fields, but apparently I imagined that.

internal/run/lint.go

@@ -7,8 +7,7 @@ import (
 // Lint is an execution step that calls `helm lint` when executed.
 type Lint struct {
 	Chart string
-
+	cmd   cmd
-	cmd cmd
 }
 
 // Execute executes the `helm lint` command.