gitignore: Add swp files (for vim).

Steve Howell · showell · commit 5c86679d5a4a · 2018-10-11T10:36:00.000-04:00
diff --git a/.gitignore b/.gitignore
@@ -45,6 +45,9 @@ zuliprc
 botserverrc
 .botserverrc
 
+# vim
+.swp
+
 # mypy
 .mypy_cache
 
