Update README.md

Author: simonchen

README.md

@@ -26,7 +26,7 @@ and you wanna mount to /mnt/fuse , you can type in the command line as follow:
 mount.davfs http://0.0.0.0:8080 /mnt/fuse
 ```
 **Note**
-- the server url could need credential as a `secrets` file (optional), you will be asked the credential if there is no `secrets' file.
+- the server url could need credential as a `secrets` file (optional), you will be asked the credential if there is no `secrets` file.
 - the mount point binds with certain `dav_user` and `dav_group`  (see below)
 
 # Default configurations