Go with souble quotes. (See https://github.com/skywinder/github-changelog-generator/pull/220#discussion_r27262657 )

spec/unit/reader_spec.rb

@@ -21,71 +21,71 @@ describe GitHubChangelogGenerator::Reader do
     @reader = GitHubChangelogGenerator::Reader.new
   end
 
-  describe '#parse_heading' do
-    context 'when heading is empty' do
-      subject { @reader.parse_heading('## ') }
+  describe "#parse_heading" do
+    context "when heading is empty" do
+      subject { @reader.parse_heading("## ") }
       it { is_expected.to be_a(Hash) }
-      it { is_expected.to include('version', 'url', 'date') }
-      it { is_expected.to include('version' => nil, 'url' => nil, 'date' => nil) }
+      it { is_expected.to include("version", "url", "date") }
+      it { is_expected.to include("version" => nil, "url" => nil, "date" => nil) }
       # TODO: Doesn't work?
       # it { is_expected.to have_all_string_keys }
     end
-    context 'when given version, url and date' do
-      subject { @reader.parse_heading('## [1.3.10](https://github.com/skywinder/Github-Changelog-Generator/tree/1.3.10) (2015-03-18)') }
-      it { is_expected.to include('version' => '1.3.10') }
-      it { is_expected.to include('url' => 'https://github.com/skywinder/Github-Changelog-Generator/tree/1.3.10') }
-      it { is_expected.to include('date' => '2015-03-18') }
+    context "when given version, url and date" do
+      subject { @reader.parse_heading("## [1.3.10](https://github.com/skywinder/Github-Changelog-Generator/tree/1.3.10) (2015-03-18)") }
+      it { is_expected.to include("version" => "1.3.10") }
+      it { is_expected.to include("url" => "https://github.com/skywinder/Github-Changelog-Generator/tree/1.3.10") }
+      it { is_expected.to include("date" => "2015-03-18") }
     end
-    context 'when no url and date is provided' do
-      subject { @reader.parse_heading('## foobar') }
-      it { is_expected.to include('version' => 'foobar', 'url' => nil, 'date' => nil) }
+    context "when no url and date is provided" do
+      subject { @reader.parse_heading("## foobar") }
+      it { is_expected.to include("version" => "foobar", "url" => nil, "date" => nil) }
     end
   end
 
-  describe '#parse' do
-    context 'when file is empty' do
-      subject { @reader.parse('') }
+  describe "#parse" do
+    context "when file is empty" do
+      subject { @reader.parse("") }
       it { is_expected.to be_an(Array) }
       it { is_expected.to be_empty }
     end
-    context 'when file has only the header' do
-      subject { @reader.parse('# Change Log') }
+    context "when file has only the header" do
+      subject { @reader.parse("# Change Log") }
       it { is_expected.to be_an(Array) }
       it { is_expected.to be_empty }
     end
   end
 
-  describe 'example CHANGELOG files' do
-    subject { @reader.read(File.expand_path(File.join(File.dirname(__FILE__), '..', 'files', self.class.description))) }
-    context 'github-changelog-generator.md' do
+  describe "example CHANGELOG files" do
+    subject { @reader.read(File.expand_path(File.join(File.dirname(__FILE__), "..", "files", self.class.description))) }
+    context "github-changelog-generator.md" do
       it { is_expected.to be_an(Array) }
       it { is_expected.not_to be_empty }
       it { expect(subject.count).to eq(28) }
-      it { expect(subject.first).to include('version' => '1.3.10') }
-      it { expect(subject.first).to include('url' => 'https://github.com/skywinder/Github-Changelog-Generator/tree/1.3.10') }
-      it { expect(subject.first).to include('date' => '2015-03-18') }
-      it { expect(subject.first).to include('content') }
-      it 'content should not be empty' do
-        expect(subject.first['content']).not_to be_empty
+      it { expect(subject.first).to include("version" => "1.3.10") }
+      it { expect(subject.first).to include("url" => "https://github.com/skywinder/Github-Changelog-Generator/tree/1.3.10") }
+      it { expect(subject.first).to include("date" => "2015-03-18") }
+      it { expect(subject.first).to include("content") }
+      it "content should not be empty" do
+        expect(subject.first["content"]).not_to be_empty
       end
     end
-    context 'bundler.md' do
+    context "bundler.md" do
       it { is_expected.to be_an(Array) }
       it { is_expected.not_to be_empty }
       it { expect(subject.count).to eq(151) }
-      it { expect(subject.first).to include('version' => '1.9.1') }
-      it { expect(subject.first).to include('url' => nil) }
-      it { expect(subject.first).to include('date' => '2015-03-21') }
-      it { expect(subject.first).to include('content') }
-      it 'content should not be empty' do
-        expect(subject.first['content']).not_to be_empty
+      it { expect(subject.first).to include("version" => "1.9.1") }
+      it { expect(subject.first).to include("url" => nil) }
+      it { expect(subject.first).to include("date" => "2015-03-21") }
+      it { expect(subject.first).to include("content") }
+      it "content should not be empty" do
+        expect(subject.first["content"]).not_to be_empty
       end
     end
-    context 'angular.js.md' do
+    context "angular.js.md" do
       it { is_expected.to be_an(Array) }
       it { is_expected.not_to be_empty }
       it do
-        pending('Implement heading_level for parser.')
+        pending("Implement heading_level for parser.")
         expect(subject.count).to eq(134)
       end
       # it do