Close delverlens file

sevenkeys/delverlens/delverlens.go

@@ -15,6 +15,7 @@ func ParseExportFile(filename string) ([]DelverLensCard, error) {
 	var cards []DelverLensCard
 
 	file, err := os.Open("/home/viciouscirce/dox/sevenkeys_imports/" + filename)
+	defer file.Close()
 	if err != nil {
 		return cards, err
 	}