Bump tests to Rails 5.2 (#84)

* Add overridable jsonapi_context

This allows developers to set "context" as whatever they'd like

* Bump tests to Rails 5.2

Author: richmolj

Appraisals

@@ -5,7 +5,7 @@ appraise "rails-4" do
 end
 
 appraise "rails-5" do
-  gem "rails", "~> 5.0"
+  gem "rails", "~> 5.2"
   gem 'jsonapi-rails', '~> 0.3.1', require: 'jsonapi/rails'
   gem 'rspec-rails'
 end

gemfiles/rails_5.gemfile

@@ -2,7 +2,7 @@
 
 source "https://rubygems.org"
 
-gem "rails", "~> 5.0"
+gem "rails", "~> 5.2"
 gem "jsonapi-rails", "~> 0.3.1", :require => "jsonapi/rails"
 gem "rspec-rails"