Enable pgsql test

.travis.yml

@@ -8,12 +8,12 @@ language: php
 
 php:
 - '5.3'
-#- '5.4'
-#- '5.5'
-#- '5.6'
-#- '7.0'
-#- '7.1'
-#- nightly
+- '5.4'
+- '5.5'
+- '5.6'
+- '7.0'
+- '7.1'
+- nightly
 
 addons:
   mariadb: '10.0'
@@ -44,7 +44,7 @@ env:
   matrix:
   # MariaDB overrides MySQL installation so it's not possible to test both yet
   #- DB=mysql
-  #- DB=mariadb
+  - DB=mariadb
   - DB=postgresql
   # TODO
   #- DB=sqlite
@@ -58,8 +58,7 @@ matrix:
   allow_failures:
   - php: 7.1
   - php: nightly
-  # FIXME
-  #- env: DB=postgresql
+  - env: DB=postgresql
   # TODO
   #- env: DB=sqlite