v1.13.3

What's Changed

• Add detection for mathematical and letterlike symbols by @umputun in #101
• ignore classifier check if either spam or ham samples not loaded by @umputun in #99
• Bump the go-modules-updates group in /_examples/simplechat with 2 updates by @dependabot in #96

Full Changelog: v1.13.2...v1.13.3