Update set script

set.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
 
 xelatex master.tex
-convert -verbose -density 150 master.pdf -quality 100 -sharpen 0x1.0 -append master.png
+convert -verbose -density 150 master.pdf -strip -quality 100 -sharpen 0x1.0 -append master.png
+convert master.png -trim master.png