Bump pg from 1.4.6 to 1.5.1

Bumps [pg](https://github.com/ged/ruby-pg) from 1.4.6 to 1.5.1.
- [Release notes](https://github.com/ged/ruby-pg/releases)
- [Changelog](https://github.com/ged/ruby-pg/blob/master/History.md)
- [Commits](ged/ruby-pg@v1.4.6...v1.5.1)

---
updated-dependencies:
- dependency-name: pg
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Gemfile

@@ -16,7 +16,7 @@ gem "coderay"
 gem "redcarpet"
 
 gem "uglifier"
-gem "pg", "~> 1.4", group: :production
+gem "pg", "~> 1.5", group: :production
 gem "rollbar"
 
 gem "puma"

Gemfile.lock

@@ -138,7 +138,7 @@ GEM
     parallel (1.22.1)
     parser (3.2.0.0)
       ast (~> 2.4.1)
-    pg (1.4.6)
+    pg (1.5.1)
     pry (0.14.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
@@ -272,7 +272,7 @@ DEPENDENCIES
   faker
   jquery-rails
   listen
-  pg (~> 1.4)
+  pg (~> 1.5)
   pry-rails
   puma
   rack-timeout