Update pg requirement from >= 0.18, <= 1.3 to >= 0.18, <= 1.5

Recreation of dependabot PR due to CI changes not being picked up

Author: Tabby

statesman.gemspec

@@ -26,7 +26,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "bundler", "~> 2"
   spec.add_development_dependency "gc_ruboconfig", "~> 3.6.0"
   spec.add_development_dependency "mysql2", ">= 0.4", "< 0.6"
-  spec.add_development_dependency "pg", ">= 0.18", "<= 1.3"
+  spec.add_development_dependency "pg", ">= 0.18", "<= 1.5"
   spec.add_development_dependency "rails", ">= 5.2"
   spec.add_development_dependency "rake", "~> 13.0.0"
   spec.add_development_dependency "rspec", "~> 3.1"