v0.3.3

What's Changed

• derive: fix SPDX syntax by @Kijewski in #155
• book: suggest to disable html escaping in "templates in templates" section by @malteneuss in #156
• parser: debug output for Syntax/InnerSyntax are swapped by @Kijewski in #159
• ci: fix a few typos and add check by @Kijewski in #160
• Fix clippy warning by @Kijewski in #162
• Improve error message for unclosed items by @GuillaumeGomez in #166
• parser: add optional {% endwhen %} by @Kijewski in #165
• parser: add context information for unknown tags by @Kijewski in #167
• parser: make {#-#} a syntax error by @Kijewski in #169
• Implement pluralize filter by @Kijewski in #170
• Fix invalid condition optimization by @GuillaumeGomez in #171
• Add more tests for ! operator by @GuillaumeGomez in #172

Full Changelog: v0.3.2...v0.3.3