readme file updated

README.md

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 In order to visualize the content of the downloaded HDF, Nexus files (and Tango Control System data), you have to get the DataBrowser application.
 
-<p style="text-align: center"><img src="https://support.hdfgroup.org/images/hdf_logo.jpg" alt="HDF" height=55 />&nbsp;&nbsp;<img src="https://manual.nexusformat.org/_images/NeXus.png" alt="NeXus" height=55 />&nbsp;&nbsp;<img src="https://www.tango-controls.org/static/tango/img/logo_tangocontrols.png" alt="Tango" height=55 />&nbsp;&nbsp;<img src="https://epics-controls.org/wp-content/uploads/2018/08/EPICS_black_blue_logo_rgb_1000p_v03.png" alt="EPICS" height=55 /></p>
+<p style="text-align: center"><img src="https://support.hdfgroup.org/assets/img/The_HDF_Group_stackedlogo.png" alt="HDF" height=55 />&nbsp;&nbsp;<img src="https://manual.nexusformat.org/_images/NeXus.png" alt="NeXus" height=55 />&nbsp;&nbsp;<img src="https://www.tango-controls.org/static/tango/img/logo_tangocontrols.png" alt="Tango" height=55 />&nbsp;&nbsp;<img src="https://epics-controls.org/wp-content/uploads/2018/08/EPICS_black_blue_logo_rgb_1000p_v03.png" alt="EPICS" height=55 /></p>
 
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 # What is DataBrowser?