Unsupported HDF5 version: 1.10.0

It seems `torch-hdf5` doesn't support 1.10.0 now.

```
$ th -lhdf5
could not load hdf5, skipping
/usr/local/torch/install/share/lua/5.1/hdf5/ffi.lua:71: Unsupported HDF5 version: 1.10.0
stack traceback:
[C]: in function 'error'
/usr/local/torch/install/share/lua/5.1/hdf5/ffi.lua:71: in function 'checkHDF5Version'
/usr/local/torch/install/share/lua/5.1/hdf5/ffi.lua:78: in main chunk
[C]: in function 'dofile'
/usr/local/torch/install/share/lua/5.1/torch/init.lua:54: in function 'include'
/usr/local/torch/install/share/lua/5.1/hdf5/init.lua:29: in main chunk
[C]: in function 'require'
...ocal/torch/install/lib/luarocks/rocks/trepl/scm-1/bin/th:48: in function <...ocal/torch/install/lib/luarocks/rocks/trepl/scm-1/bin/th:48>
[C]: in function 'xpcall'
...ocal/torch/install/lib/luarocks/rocks/trepl/scm-1/bin/th:48: in main chunk
[C]: at 0x00406670
```

Start with the failure reported by `th -lhdf5` and inspect `ffi.lua` at the `checkHDF5Version` call on line 71. Determine how HDF5 versions are checked and what is needed for 1.10.0 support; done means the command loads HDF5 without reporting that version as unsupported.

Written by the indexing model from the issue text.