Merge pull request #1847 from nloveladyallen/patch-1

Remove redundancy in Global/Vim.gitignore

Global/Vim.gitignore

 # swap
 [._]*.s[a-w][a-z]
 [._]s[a-w][a-z]
-# persistent undo 
-*.un~
 # session
 Session.vim
 # temporary