v2.10.0

• Add Decode method (#192)
• Add Alias method (#171)
• Rename Array.Contains to Array.ContainsAll (#252)
• Rename Array.Elements to Array.ConsistsOf (#252)
• Rename Cookie.HaveMaxAge to Cookie.HasMaxAge (#252)
• Rename DateTime.GetXxx to DateTime.Xxx (#252)
• Preparations to make lib thread-safe (#229)
• Check call order of Request methods (#162)
• Improve documentation
• Improve test coverage