Small changes to issue templates (#385)

* Add period in feature request issue template

* Delete old issue template

Author: thechenky

.github/ISSUE_TEMPLATE.md

@@ -1,7 +1,7 @@
 ---
 name: "\U0001F4A1 Feature Request"
 about: Have a feature you'd like to see in the functions SDK? Request it through our
-  support channel
+  support channel.
 title: ''
 labels: ''
 assignees: ''