Pin postgres version in build

Fixes in rails 6 update: Your version of PostgreSQL (90224) is too old. Active Record supports PostgreSQL >= 9.3. travis seems to be running multiple postgres versions by default.
rubygems · Jun 18, 2019 · 68e962e · 68e962e
1 parent 62b7074
commit 68e962e
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diff --git a/.travis.yml b/.travis.yml
@@ -17,6 +17,7 @@ addons:
     packages:
       - elasticsearch
       - openjdk-8-jre-headless
+  postgresql: "9.6"
 
 services:
   - elasticsearch

diff --git a/docker-compose.yml b/docker-compose.yml
@@ -1,7 +1,7 @@
 version: '3'
 services:
   db:
-    image: postgres:9
+    image: postgres:9.6
     ports:
       - "5432:5432"
   cache: