v0.3.0
New features:
- Added option add option: csv.null-string for treating empty strings as null (thanks to @justin2004). See d03c3bb d83627b
- Fully configurable HTTP client, supporting all HTTP methods, headers, etc... to call Web APIs. See #67
- HTML, added support for headless browser (thanks to @justin2004). See c3aa0e1
- New list functions: before, after, previous, next. See #78