spellcheck goal in Makefile

Makefile

@@ -13,7 +13,7 @@ build/%.pdf: %.tex
 	mv $< $@ # atomic!
 	cp $@ $<
 
-.PHONY: show clean distclean
+.PHONY: show clean distclean spellcheck
 
 show: $(NAME).pdf
 	xdg-open $<
@@ -24,3 +24,6 @@ clean:
 
 distclean: clean
 	rm -f $(NAME).pdf
+
+spellcheck:
+	aspell check $(NAME).tex --mode=tex --lang=de_DE