Update glide.yaml.md

add commit hash example

docs/glide.yaml.md

diff --git a/docs/glide.yaml.md b/docs/glide.yaml.md
index 7592321..7b700eb 100644
--- a/docs/glide.yaml.md
+++ b/docs/glide.yaml.md
@@ -23,6 +23,7 @@
       repo:    git@github.com:Masterminds/vcs
       vcs:     git
     - package: github.com/codegangsta/cli
+      version: f89effe81c1ece9c5b0fda359ebd9cf65f169a51
     - package: github.com/Masterminds/semver
       version: ^1.0.0
     testImport: