add .bib files to gitnore
diff --git a/.gitignore b/.gitignore
index 3ca391a..367e1ce 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 *.Rhistory
 *.RData
 *.Ruserdata
+*.bib
 .Rproj.user
 *skeleton.html
 skeleton_files/