Update ruby, bundler, and rake

.travis.yml

@@ -1,7 +1,7 @@
 language: ruby
 rvm:
-  - 2.2.3
+  - 2.6.4
 before_install:
   - sudo apt-get -qq update
   - sudo apt-get install -y catdoc unrtf poppler-utils tesseract-ocr
-  - gem install bundler -v 1.10.6
+  - gem install bundler -v 2.0.1

CHANGELOG

@@ -9,6 +9,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [0.3.2] - 2019-09-02
 - Set minimum Nokogiri version to 1.10.4. See CVE-2019-5477.
 - Fix encoding issues for PDFs.
+- Bump development dependencies to bundler version 2 and
+  rake version 12
+- Update travis file to use ruby 2.6.4 and bundler 2.0.1
 
 ## [0.3.1] - 2019-01-16
 

plaintext.gemspec

@@ -4,7 +4,7 @@ $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'plaintext/version'
 
 Gem::Specification.new do |spec|
-  spec.name          = "plaintext"
+  spec.name          = 'plaintext'
   spec.version       = Plaintext::VERSION
   spec.authors       = ['Jens Krämer', 'Planio GmbH', 'OpenProject GmbH']
   spec.email         = ['[email protected]']
@@ -15,15 +15,15 @@ Gem::Specification.new do |spec|
   spec.license       = 'GPL-2.0'
 
   spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
-  spec.bindir        = "exe"
+  spec.bindir        = 'exe'
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
-  spec.require_paths = ["lib"]
+  spec.require_paths = ['lib']
 
-  spec.add_dependency 'rubyzip', '~> 1.2.1'
-  spec.add_dependency 'nokogiri', '>= 1.10.4'
   spec.add_dependency 'activesupport', '>2.2.1 '
+  spec.add_dependency 'nokogiri', '~> 1.10', '>= 1.10.4'
+  spec.add_dependency 'rubyzip', '~> 1.2.1'
 
-  spec.add_development_dependency "bundler"
-  spec.add_development_dependency "rake", "~> 10.0"
-  spec.add_development_dependency "rspec"
+  spec.add_development_dependency 'bundler', '~> 2.0'
+  spec.add_development_dependency 'rake', '~> 12.0'
+  spec.add_development_dependency 'rspec'
 end