Fix ignores and make clean

.gitignore

@@ -7,7 +7,9 @@ dblp/*.gz
 dblp/*.md5
 fixtures/*.json
 graphs/*.dot
+graphs/*.pdf
 graphs/*.svg
+graphs/*.tex
 
 # Python
 __pycache__

Makefile

@@ -11,7 +11,9 @@ all: graphs/citations.svg graphs/sok.svg
 
 clean:
 	rm -f graphs/*.dot
+	rm -f graphs/*.pdf
 	rm -f graphs/*.svg
+	rm -f graphs/*.tex
 
 .dot.pdf:
 	$(DOT) -Tpdf -o$*.pdf $<