v0.6.0.pre.beta.3

Bug fixes

• Occur error when blank feature [GH-80]

Refactoring

• TF::Printer::Scenario ➡️ TF::Renderer::Html::Scenario [GH-71]
• TF::Printer::TabXXXStatistics ➡️ TF::Renderer::Html::StatisticsXXX [GH-72]
• TF::Printer::RuntimeError ➡️ TF::Renderer::Html::RuntimeError [GH-74]
• TF::Printer::Index ➡️ TF::Renderer::Html::Index [GH-75]
• TF::Template 's methods ➡️ TF::Renderer::Html [GH-78]