add the ist file generated by glossaries-extra package (#3056)

MohHizzani · shiftkey · commit 6cb96f4a6ece · 2019-05-16T17:35:05.000-03:00
diff --git a/TeX.gitignore b/TeX.gitignore
@@ -259,3 +259,6 @@ TSWLatexianTemp*
 
 # standalone packages
 *.sta
+
+# glossaries-extra
+*.ist
