v4.0.0

Changes in this long awaited release:

Library

• First semver version with Go modules compatibility
• Several bug fixes
• Improved error handling
• Several refactorings to speed up execution and reduce allocations, including support for io.Writerin Execute() functions and short-circuit evaluations in expressions
• Add TemplateSet.FromBytes
• Add RenderTemplateBytes
• Add Template.ExecuteWriterUnbuffered
• Add TemplateLoader interface and according functions for virtual filesystem support (incl. support for multiple loaders)
• Add pongo2.SetAutoescape for a global behavior change
• Add whitespace control for tags and blocks, supporting {%- and -%} for tags and pongo2.Options for blocks
• Add pongo2.CleanCache to remove files from the template cache
• Add support for template functions that return an error as the second return value
• Add Template.ExecuteBlocks to render supplied list of blocks only

See v3.0...v4.0.0 for a full list of changes.
Thanks to all contributors!

Template Language

• Add support for single quotes in variables, functions and tags
• Add support for if_exists-flag in include-tag
• Add support for sorted-flag in for-tag with support for maps and arrays/slices
• Add block.Super support
• Add split filter