Update packages/yasnippet by subtree-merging from its github-based upstream

[gnu-emacs-elpa] / packages / yasnippet / snippets / csharp-mode / using.2

# contributor: Alejandro Espinoza Esparza <aespinoza@structum.com.mx>
# name: using System....;
# key: using
# --
using System.$1;