Update planned changes - move to Go 1.17 in next minor ver

Author: ibmmqmet

DEPRECATIONS.md

@@ -6,6 +6,10 @@ Removal of function will only happen on a major version change.
 
 **Note:** There is no date currently planned for a new major release.
 
+## In next minor version
+The compiler will be set to use Go 1.17 at minimum from 
+the +build lines in the directives 
+
 ## In next major version
 The following interfaces are planned to be removed: