[SUG] Fix DSO catalog data

guide/ch_advanced_use.tex

@@ -248,12 +248,12 @@ \subsection{More Deep-Sky Objects}
 number in the version of Stellarium DSO catalog meaning version of catalog structure 
 and second number meaning version of data.}, see section \ref{sec:dso:catalog}), 
 but an \emph{extended edition} of DSO catalog with over one million objects (up to $20.0^m$ for galaxies) may be downloaded
-from Stellarium's Github website\footnote{\url{https://github.com/Stellarium/stellarium-data/releases/tag/dso-3.19}}:
+from Stellarium's Github website\footnote{\url{https://github.com/Stellarium/stellarium-data/releases/tag/dso-3.20}}:
 
 \noindent\begin{tabular}{lllr}
 \toprule
 \emph{Version; Edition} & \emph{Filename} & \emph{MD5 hash} & \emph{Size}\\\midrule
-3.19; extended & \file{catalog-3.19.dat} & \texttt{5d14852f9840866782a2b9296fac943e} & 28MB\\\bottomrule
+3.20; extended & \file{catalog-3.20.dat} & \texttt{8b25343a5983ef5841cbc0b60e96f4dc} & 28MB\\\bottomrule
 \end{tabular}
 
 The file can be placed in a folder named \file{nebulae/default} inside the \emph{user directory}