guile-2.2.3 ppa for ubuntu 16.04

[Dan Kegel]

Hi folks,
I did a simple update of Ubuntu's guile package for those who need guile 2.2.3.
Here's how to get it:

$ sudo add-apt-repository ppa:dank/guile-2.2
$ sudo apt-get update
$ sudo apt-get install guile-2.2
$ guile
GNU Guile 2.2.3
...
Enter `,help' for help.
scheme@(guile-user)> (display (version))
2.2.3scheme@(guile-user)>

That is, simultaneously, all the testing I've done on it besides 'make
check' :-)

Enjoy,
Dan