Move assets folder along with notebook

src/notebook/Notebook.jl

@@ -94,7 +94,7 @@ function save_notebook(io, notebook::Notebook)
         print(io, c.code)
         print(io, _cell_suffix)
     end
-
+    
     println(io, _cell_id_delimiter, "Cell order:")
     for c in notebook.cells
         delim = c.code_folded ? _order_delimiter_folded : _order_delimiter
@@ -107,7 +107,7 @@ function save_notebook(notebook::Notebook, path::String)
     open(path, "w") do io
         save_notebook(io, notebook)
     end
-end
+    end
 
 save_notebook(notebook::Notebook) = save_notebook(notebook, notebook.path)
 
@@ -231,5 +231,8 @@ function move_notebook!(notebook::Notebook, newpath::String)
     if oldpath_tame != newpath_tame
         rm(oldpath_tame)
     end
+    if isdir("$oldpath_tame.assets")
+        mv("$oldpath_tame.assets", "$newpath_tame.assets")
+    end
     notebook
 end