[io][HDF5File] remove `r+` mode from the valid mode

tomoscan/io.py

@@ -56,7 +56,7 @@ class HDF5File(h5py.File):
         :param bool swmr: when not specified: try both modes when `mode=='r'`
         :param **kwargs: see `h5py.File.__init__`
         """
-        if mode not in ('r', 'r+', 'w', 'w-', 'x', 'a'):
+        if mode not in ('r', 'w', 'w-', 'x', 'a'):
             raise ValueError('invalid mode {}'.format(mode))
 
         with self._protect_init(filename):