update matplotlib version in handouts

Author: jimustafa

handout-beginner.tex

@@ -296,7 +296,7 @@ \subsection*{\rmfamily Save \mdseries (bitmap or vector format)}
 %
 \vfill
 %
-{\scriptsize Matplotlib 3.2 handout for beginners. Copyright (c)
+{\scriptsize Matplotlib 3.4.2 handout for beginners. Copyright (c)
   2020 Nicolas P. Rougier. Released under a CC-BY International 4.0
   License. Supported by NumFocus Grant \#12345.\par}
 

handout-intermediate.tex

@@ -182,6 +182,7 @@ \subsection*{\rmfamily Colors}
 %\includegraphics[width=\linewidth]{colormap-magma.pdf} \medskip
 
 % -----------------------------------------------------------------------------
+\vspace{-1em}
 \subsection*{\rmfamily Size \& DPI}
 
 Consider a square figure to be included in a two-columns A4 paper with
@@ -196,7 +197,7 @@ \subsection*{\rmfamily Size \& DPI}
 
 \vfill
 %
-{\scriptsize Matplotlib 3.2 handout for intermediate users. Copyright
+{\scriptsize Matplotlib 3.4.2 handout for intermediate users. Copyright
   (c) 2020 Nicolas P. Rougier. Released under a CC-BY 4.0
   License. Supported by NumFocus Grant \#12345.\par}
 

handout-tips.tex

@@ -242,7 +242,7 @@ \subsection*{\rmfamily Read the documentation}
 
 \vfill
 %
-{\scriptsize Matplotlib 3.2 handout for tips \& tricks.
+{\scriptsize Matplotlib 3.4.2 handout for tips \& tricks.
              Copyright (c) 2020 Nicolas P. Rougier.
              Released under a CC-BY 4.0 License.
              Supported by NumFocus Grant \#12345.\par}