Update URL to Paul Tol technical note

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@ -528,7 +528,7 @@ possible as well as from black and white, can be discerned item under different
lighting and display environments and by color-blind viewers, while matching
well together.
In a \href{https://personal.sron.nl/~pault/colourschemes.pdf}{technical note}
In a \href{https://personal.sron.nl/~pault/data/colourschemes.pdf}{technical note}
for SRON, Paul Tol proposed a palette of colors satisfying these constraints.
The sub-package |pgfplotsthemetol| defines palettes for |pgfplots| charts
based on Tol's work.