Update README

Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>

README.md

@@ -18,12 +18,15 @@ following features are already implemented:
   reconstructions,
 * Riemann solvers of Roe- and HLL-types (HLL, HLLC, and HLLD),
 * standard boundary conditions: periodic, open, reflective, hydrostatic, etc.
+* turbulence driving using Alvelius or Ornstein–Uhlenbeck methods,
 * viscous and resistive source terms,
-* suppor for passive scalars (up to 100),
-* data stored in the HDF5 format,
+* support for passive scalars (up to 100),
+* data stored in internal XML+binary or HDF5 format,
+* Python interface to read snapshots in both formats,
 * MPI parallelization,
 * completely written in Fortran 2003,
-* Python interface to read data.
+* minimum requirements, only Fortran compiler and Python are required to
+  prepare, run, and analyze your simulations.
 
 This program is free software: you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -53,10 +56,12 @@ Requirements
       version 18.10 or newer,
     - [Intel Fortran](https://software.intel.com/en-us/fortran-compilers)
       compiler version 9.0 or newer.
-* [HDF5 libraries](https://www.hdfgroup.org/solutions/hdf5/), tested with
-  version 1.10 or newer.
-* [OpenMPI](https://www.open-mpi.org/) for parallel runs, tested with version
-  1.8 or newer.
+* Optional, but recommended, [OpenMPI](https://www.open-mpi.org/) for parallel
+  runs, tested with version 1.8 or newer.
+* Optional [HDF5 libraries](https://www.hdfgroup.org/solutions/hdf5/), tested
+  with version 1.10 or newer. The code now uses the new XML-binary snapshot
+  format. However, if you still wants to use older HDF5 snapshot format, you
+  will need these libraries.
 
 
 Environment Variables