fix: create image permission denied in linux (change mkdir permission bits to 0755)

Makefile

@@ -1,6 +1,6 @@
 BUILD_ENV := CGO_ENABLED=0
 APP=wechatmp2markdown
-VERSION=v1.1.5
+VERSION=v1.1.6
 
 # linux or mac 环境编译
 # make [cmd]

format/format.go

@@ -92,7 +92,7 @@ func FormatAndSave(article parse.Article, filePath string) error {
 
 	// make basePath dir if not exists
 	if _, err := os.Stat(basePath); err != nil {
-		if err := os.MkdirAll(basePath, 0644); err != nil {
+		if err := os.MkdirAll(basePath, 0755); err != nil {
 			panic(err)
 		}
 	}