Update info message to match version

Refers to request in:
openfaas/templates#265

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <[email protected]>

Author: alexellis

template/golang-http/template.yml

@@ -1,7 +1,7 @@
 language: golang-http
 fprocess: ./handler
 welcome_message: |
-  You have created a new function which uses Golang 1.13.
+  You have created a new function which uses Go 1.15.
 
   To include third-party dependencies, use Go modules and use
   "--build-arg GO111MODULE=on" with faas-cli build or configure this  

template/golang-middleware/template.yml

@@ -1,7 +1,7 @@
 language: golang-middleware
 fprocess: ./handler
 welcome_message: |
-  You have created a new function which uses Golang 1.13.
+  You have created a new function which uses Go 1.15.
 
   To include third-party dependencies, use Go modules and use
   "--build-arg GO111MODULE=on" with faas-cli build or configure this