Fix typo (#312)

Author: fffed

README.md

@@ -106,7 +106,7 @@ highlight NvimTreeFolderIcon guibg=blue
 - type `d` to delete a file (will prompt for confirmation)
 - type `]c` to go to next git item
 - type `[c` to go to prev git item
-- type '-' to naviate up to the parent directory of the current file/directory
+- type `-` to navigate up to the parent directory of the current file/directory
 - if the file is a directory, `<CR>` will open the directory otherwise it will open the file in the buffer near the tree
 - if the file is a symlink, `<CR>` will follow the symlink (if the target is a file)
 - `<C-v>` will open the file in a vertical split