Merge pull request #1659 from AshleyS/master

Fixed base64 decode parameter for newer versions of base64 binary

plugins/encode64/encode64.plugin.zsh

 encode64(){ echo -n $1 | base64 }
-decode64(){ echo -n $1 | base64 -D }
+decode64(){ echo -n $1 | base64 --decode }
 alias e64=encode64
 alias d64=decode64