Update bundler to 1.17

(cherry picked from commit a51d07f)

Author: lgebhardt

.travis.yml

@@ -2,14 +2,22 @@ language: ruby
 sudo: false
 env:
   - "RAILS_VERSION=4.2.11"
-  - "RAILS_VERSION=5.0.7.1"
-  - "RAILS_VERSION=5.1.6.1"
-  - "RAILS_VERSION=5.2.2"
-  - "RAILS_VERSION=master"
+  - "RAILS_VERSION=5.0.7.2"
+  - "RAILS_VERSION=5.1.7"
+  - "RAILS_VERSION=5.2.3"
+#  - "RAILS_VERSION=6.0.0.beta1"
+#  - "RAILS_VERSION=master"
 rvm:
   - 2.3.8
-  - 2.4.5
-  - 2.5.3
+  - 2.4.7
+  - 2.5.6
+  - 2.6.4
 matrix:
   allow_failures:
-    - env: "RAILS_VERSION=master"
+    - env: "RAILS_VERSION=master"
+    - env: "RAILS_VERSION=6.0.0.beta1"
+  exclude:
+    - rvm: 2.6.4
+      env: "RAILS_VERSION=4.2.11"
+before_install:
+  - gem install bundler --version 1.17.3

jsonapi-resources.gemspec

@@ -19,7 +19,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
   spec.required_ruby_version = '>= 2.1'
 
-  spec.add_development_dependency 'bundler', '~> 1.5'
+  spec.add_development_dependency 'bundler', '~> 1.17.3'
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'minitest'
   spec.add_development_dependency 'minitest-spec-rails'