Bump pg from 1.0.0 to 1.1.3

Bumps [pg](https://bitbucket.org/ged/ruby-pg) from 1.0.0 to 1.1.3.
- [Changelog](https://bitbucket.org/ged/ruby-pg/src/master/History.rdoc)
- [Commits](https://bitbucket.org/ged/ruby-pg/branches/compare/v1.1.3..v1.0.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Gemfile.lock

@@ -219,7 +219,7 @@ GEM
     omniauth-twitter (1.4.0)
       omniauth-oauth (~> 1.1)
       rack
-    pg (1.0.0)
+    pg (1.1.3)
     pg_query (1.0.2)
     pghero (2.1.1)
       activerecord