Update configuration for Travis CI.

Author: Ekaterina Sokolova

.travis.yml

@@ -20,6 +20,9 @@ notifications:
         on_failure: always
 
 env:
+    - PYTHON_VERSION=3 PG_VERSION=17
+    - PYTHON_VERSION=3 PG_VERSION=16
+    - PYTHON_VERSION=3 PG_VERSION=15
     - PYTHON_VERSION=3 PG_VERSION=14
     - PYTHON_VERSION=3 PG_VERSION=13
     - PYTHON_VERSION=3 PG_VERSION=12
@@ -32,3 +35,8 @@ env:
 #    - PYTHON_VERSION=2 PG_VERSION=9.6
 #    - PYTHON_VERSION=2 PG_VERSION=9.5
 #    - PYTHON_VERSION=2 PG_VERSION=9.4
+
+matrix:
+    allow_failures:
+        - env: PYTHON_VERSION=3 PG_VERSION=11
+        - env: PYTHON_VERSION=3 PG_VERSION=10