[TASK] Ignore *.bak files.

.gitignore

@@ -8,4 +8,5 @@
 *.toc
 *.out
 *.synctex.gz
+*.bak
 *.pdf

Makefile

@@ -9,5 +9,5 @@ render:
 	pdflatex ${NAME}.tex
 
 clean:
-	rm -f *.aux *.bbl *.blg *.dvi *.log *.lot *.lof *.toc *.out *.synctex.gz
+	rm -f *.aux *.bbl *.blg *.dvi *.log *.lot *.lof *.toc *.out *.synctex.gz *.bak
 	rm -f *.pdf