Add faas version to issue template

This commit adds a line to the issue template
to request the faas-cli version and provider
information to the issue template to help diagnose
issues faster

Signed-off-by: Burton Rheutan <rheutan7@gmail.com>

.github/ISSUE_TEMPLATE.md

@@ -26,6 +26,8 @@
 
 ## Your Environment
 <!--- Include as many relevant details about the environment you experienced the bug in -->
+* FaaS-CLI version ( Full output from: `faas-cli version` ):
+
 * Docker version `docker version` (e.g. Docker 17.0.05 ):
 
 * Are you using Docker Swarm or Kubernetes (FaaS-netes)?