Add recommendation to pull pkg.template CI configs (ruslo#1400)

docs/creating-new/update.rst

@@ -63,6 +63,19 @@ Fetch latest CI configs, you may need to run ``git pull`` if you have
   [hunter]> git checkout pkg.hunter_box_1
   [hunter]> git pull
 
+If the package has not been updated in some time, the CI toolchains 
+may have fallen out of date.  It is preferable to keep the CI 
+configuration in sync with the working defaults from ``pkg.template`` 
+to make sure the package will build with recent compilers and to help 
+ensure cache hits for any required Hunter managed dependencies. 
+
+.. code-block:: none
+  
+  [hunter]> git checkout pkg.template
+  [hunter]> git pull
+  [hunter]> git checkout pkg.hunter_box_1
+  [hunter]> git merge pkg.template
+
 Create temporary branch ``test.hunter_box_1`` for testing basing on
 ``pkg.hunter_box_1``: