refactor: adjust style

Author: chenquan

README.md

@@ -18,12 +18,12 @@ Usage:
   diskusage [flags]
 
 Flags:
-  -d, --depth int       Shows the depth of the tree directory structure (default 1)
-      --dir string      Dir path (default "./")
-  -f, --filter string   Make regular expression filter (default ".")
+  -d, --depth int       shows the depth of the tree directory structure (default 1)
+      --dir string      dir path (default "./")
+  -f, --filter string   regular expression filter (default ".+")
   -h, --help            help for diskusage
-  -t, --type strings    Only count certain types of files  (default all)
-  -u, --unit string     Displayed units. optional: B(Bytes), K(KB), M(MB), G(GB), T(TB) (default "M")
-  ```
+  -t, --type strings    only count certain types of files  (default all)
+  -u, --unit string     displayed units. optional: B(Bytes), K(KB), M(MB), G(GB), T(TB) (default "M")
+```
 
 ![](image/cmd.png)

cmd/root.go

@@ -43,5 +43,5 @@ func init() {
 	rootCmd.Flags().String("dir", "./", "dir path")
 	rootCmd.Flags().IntP("depth", "d", 1, "shows the depth of the tree directory structure")
 	rootCmd.Flags().StringSliceP("type", "t", []string{}, "only count certain types of files  (default all)")
-	rootCmd.Flags().StringP("filter", "f", ".*", "regular expression filter")
+	rootCmd.Flags().StringP("filter", "f", ".+", "regular expression filter")
 }