Update R.gitignore (#3034)

zy26 · shiftkey · commit 26f49b0c26f6 · 2019-04-22T08:56:28.000-03:00
ignore knitr and R markdown default cache directories in subdirectories
diff --git a/R.gitignore b/R.gitignore
@@ -28,7 +28,7 @@ vignettes/*.pdf
 .httr-oauth
 
 # knitr and R markdown default cache directories
-/*_cache/
+*_cache/
 /cache/
 
 # Temporary files created by R markdown
