Commented out running travis tests for legacy versions (to reduce the load on dockerhub and make the "toomanyrequests: You have reached your pull rate limit." error less likely)

Author: kulaginm

Diff for: .travis.yml

@@ -20,15 +20,15 @@ notifications:
         on_failure: always
 
 env:
-    - PYTHON_VERSION=2 PG_VERSION=10
-    - PYTHON_VERSION=2 PG_VERSION=9.6
-    - PYTHON_VERSION=2 PG_VERSION=9.5
-    - PYTHON_VERSION=2 PG_VERSION=9.4
     - PYTHON_VERSION=3 PG_VERSION=14
     - PYTHON_VERSION=3 PG_VERSION=13
     - PYTHON_VERSION=3 PG_VERSION=12
     - PYTHON_VERSION=3 PG_VERSION=11
     - PYTHON_VERSION=3 PG_VERSION=10
-    - PYTHON_VERSION=3 PG_VERSION=9.6
-    - PYTHON_VERSION=3 PG_VERSION=9.5
-    - PYTHON_VERSION=3 PG_VERSION=9.4
+#    - PYTHON_VERSION=3 PG_VERSION=9.6
+#    - PYTHON_VERSION=3 PG_VERSION=9.5
+#    - PYTHON_VERSION=3 PG_VERSION=9.4
+#    - PYTHON_VERSION=2 PG_VERSION=10
+#    - PYTHON_VERSION=2 PG_VERSION=9.6
+#    - PYTHON_VERSION=2 PG_VERSION=9.5
+#    - PYTHON_VERSION=2 PG_VERSION=9.4