Merge pull request #4418 from Gnouc/master

Encode64 Plugin - Fix wrong `echo` usage

plugins/encode64/encode64.plugin.zsh

-encode64(){ echo -n $1 | base64 }
-decode64(){ echo -n $1 | base64 --decode }
+encode64(){ printf '%s' $1 | base64 }
+decode64(){ printf '%s' $1 | base64 --decode }
 alias e64=encode64
 alias d64=decode64