Added CustomBooleanReplacer to define a mapping for boolean values

• Fixed a crash when a developer wants to see the content of the Columns property during debugging
• Added CustomBooleanReplacer to define a mapping for boolean values

Removed support of .NET Framework 4.5, added support of .NET Framework 4.7.2, 4.8, .NET 5.0 and .NET 6.0

Update README.md

Fixed table layout of the test results

v4.1.2

Raising the ParseError event instead of MalformedCsvException when the DefaultParseErrorAction is RaiseEvent (thanks to @lancasteradam)

4.1.1

Added an additional CsvReader/CachedCsvReader constructor parameter to specify a custom 'new line' character

4.1.0

Removed old projects ,pdated nuspec, updated RELEASE_NOTES.md