add license/language for ImapSync

- add NLPL to the list of licenses

README.md

@@ -451,7 +451,7 @@ Log management tools: collect, parse, visualize...
 **[`^        back to top        ^`](#awesome-sysadmin)**
 
 - [Claws Mail](http://www.claws-mail.org/) - Old school email client (and news reader), based on GTK+. ([Source Code](https://git.claws-mail.org/?p=claws.git;a=tree)) `GPL-3.0` `C`
-- [ImapSync](http://imapsync.lamiral.info/) - Simple IMAP migration tool for copying mailboxes to other servers. ([Source Code](https://github.com/imapsync/imapsync))
+- [ImapSync](http://imapsync.lamiral.info/) - Simple IMAP migration tool for copying mailboxes to other servers. ([Source Code](https://github.com/imapsync/imapsync)) `NLPL` `Perl`
 - [Mutt](http://www.mutt.org/) - Small but very powerful text-based mail client. ([Source Code](https://gitlab.com/muttmua/mutt))
 - [Sylpheed](http://sylpheed.sraoss.jp/en/) - Still developed predecessor to Claws Mail, lightweight mail client. ([Source Code](https://github.com/sylpheed-mail/sylpheed))
 - [Thunderbird](https://www.thunderbird.net/) - Free email application that's easy to set up and customize. ([Source Code](https://hg.mozilla.org/comm-central/file))
@@ -740,6 +740,7 @@ VPN software.
 - `LGPL-2.1` - [GNU Lesser General Public License v2.1 only](https://spdx.org/licenses/LGPL-2.1.html)
 - `MIT` - [MIT License](https://opensource.org/licenses/MIT)
 - `MPL-2.0` - [Mozilla Public License](https://www.mozilla.org/MPL/2.0/index.txt)
+- `NLPL` - [No Limit Public License](https://spdx.org/licenses/NLPL.html)
 - `Vim` - [Vim License](https://spdx.org/licenses/Vim.html)
 
 -------------------