support thumbnails in file managers

cmd/main.go

@@ -77,6 +77,7 @@ func parseFlags() (cbconvert.Options, []string) {
 
 	thumbnail := kingpin.Command("thumbnail", "Extract cover thumbnail (freedesktop spec.)")
 	thumbnail.Arg("args", "filename or directory").Required().ExistingFilesOrDirsVar(&args)
+	thumbnail.Flag("outfile", "Output file").Default("").StringVar(&opts.Outfile)
 	thumbnail.Flag("width", "Image width").Default(strconv.Itoa(0)).IntVar(&opts.Width)
 	thumbnail.Flag("height", "Image height").Default(strconv.Itoa(0)).IntVar(&opts.Height)
 	thumbnail.Flag("fit", "Best fit for required width and height").BoolVar(&opts.Fit)

cmd/versioninfo.json

@@ -3,13 +3,13 @@
 	{
 		"FileVersion": {
 			"Major": 0,
-			"Minor": 5,
+			"Minor": 6,
 			"Patch": 0,
 			"Build": 0
 		},
 		"ProductVersion": {
 			"Major": 0,
-			"Minor": 5,
+			"Minor": 6,
 			"Patch": 0,
 			"Build": 0
 		},
@@ -24,14 +24,14 @@
 		"Comments": "Comic Book converter",
 		"CompanyName": "",
 		"FileDescription": "CBconvert CLI",
-		"FileVersion": "0.5.0",
+		"FileVersion": "0.6.0",
 		"InternalName": "",
 		"LegalCopyright": "",
 		"LegalTrademarks": "",
 		"OriginalFilename": "cbconvert.exe",
 		"PrivateBuild": "",
 		"ProductName": "CBconvert",
-		"ProductVersion": "0.5.0",
+		"ProductVersion": "0.6.0",
 		"SpecialBuild": ""
 	},
 	"VarFileInfo":