fix: remove *.pdf from gitignore

Author: Moritz Jörg

.gitignore

@@ -19,7 +19,7 @@
 # these rules might exclude image files for figures etc.
 # *.ps
 # *.eps
-*.pdf
+# *.pdf
 
 ## Generated if empty string is given at "Please type another file name for output:"
 .pdf
@@ -298,4 +298,4 @@ TSWLatexianTemp*
 # REVTeX puts footnotes in the bibliography by default, unless the nofootinbib
 # option is specified. Footnotes are the stored in a file with suffix Notes.bib.
 # Uncomment the next line to have this generated file ignored.
-#*Notes.bib
+#*Notes.bib