WebC v0.5.4

• Fixes issue with HTML raw input passed to transforms (via <template webc:type>) and raw passthrough for <template webc:raw>. #48
• Better error messaging when attempting to reserved word class in JS code #45
• Milestone: https://github.com/11ty/webc/milestone/7?closed=1
• Full Changelog: v0.5.3...v0.5.4