ignore *~ files in the po directory (#3453)

MichaelChirico · web-flow · commit 5cf393421db8 · 2020-07-03T17:19:48.000-03:00
Common IME for `gettext` utilities like `tools::update_pkg_po('.')` to create these temp files (at least on Mac)
diff --git a/R.gitignore b/R.gitignore
@@ -40,3 +40,6 @@ vignettes/*.pdf
 
 # pkgdown site
 docs/
+
+# translation temp files
+po/*~
