Version 1.50

• Substituted the customized Optional with java.util.Optional
• Updated junit
• Improved json parser tests

Version 1.49

• The interfaces have been relocated within the Underscore class
• XML attribute parser has been enhanced

Version 1.48

• Improved Optional
• Removed methods Underscore.topNCompetitors() and Underscore.minimumDays()
• Updated appveyor.yml

Version 1.47

• Improved maven plugins
• Removed Json.Type.JAVA
• Optimized json generation
• Improved JSON serialization

Version 1.46

• Improved U.fetch() and U.downloadUrl()
• Added com.github.underscore.XmlBuilder

Version 1.45

• Updated maven dependencies
• Fixed Idea warnings

Version 1.44

• Replaced class Tuple with Map.Entry
• Removed class Trie and methods U.gcd(), U.findGcd()
• Fixed pack configuration

Version 1.43

• Improved modes for U.xmlToJson() and U.jsonToXml() methods
• Added methods U.xmlOrJsonToXml() and U.xmlOrJsonToJson()

Version 1.42

• Added method U.fromXmlWithoutNamespacesMap().
• Improved json to xml without attributes.

Version 1.41

• Added methods U.selectToken(map, expression) and U.selectTokens(map, expression).
• Updated readme.