Version 5.5.6

• Added experimental support for CPU profiling in V8ScriptEngine and V8Runtime.
• Improved support for newer V8 features such as promises and WebAssembly.
• Added Nothing class for better VBScript support (GitHub Issue #106).
• Added readme.txt to NuGet package (GitHub Issue #109).
• Updated API documentation.
• Tested with V8 7.4.288.26.