examples : update link to Paul Tol's color scheme [no ci] (#3140)

This commit updates the link to Paul Tol's color scheme in the
`examples/common.h` file. The previous link was outdated and
pointed to a non-existent page.

diff --git a/examples/common.h b/examples/common.h
index f6bf0a9ecaab032e6b9098e6dbce97c81dd2cf67..1aa763817ee93261f9d7b48381e2693e4410bd7e 100644 (file)
--- a/examples/common.h
+++ b/examples/common.h
@@ -283,7 +283,7 @@ static std::string set_xterm256_foreground(int r, int g, int b) {
 }
 
 // Lowest is red, middle is yellow, highest is green. Color scheme from
-// Paul Tol; it is colorblind friendly https://personal.sron.nl/~pault/
+// Paul Tol; it is colorblind friendly https://sronpersonalpages.nl/~pault
 const std::vector<std::string> k_colors = {
     set_xterm256_foreground(220,   5,  12),
     set_xterm256_foreground(232,  96,  28),