Run tests with PG15 and 16 as well

Author: df7cb

.github/workflows/regression.yml

@@ -12,7 +12,16 @@ jobs:
 
     strategy:
       matrix:
-        pgversion:  [ 9.5, 9.6, 10, 11, 12, 13, 14 ]
+        pgversion:
+          - 9.5
+          - 9.6
+          - 10
+          - 11
+          - 12
+          - 13
+          - 14
+          - 15
+          - 16
 
     env:
       PGVERSION: ${{ matrix.pgversion }}