v1.0.0-alpha.3

Improvements

• Support to use README as the default entry, by @xiaohuoni , #19
• Support to set empty title to hide it, by @xiaohuoni , #17
• Ignore node_modules when searching routes
• Suppor to export class component as a demo
• Use a common way to get frontmatter and meta data for markdown file, #20

Fixed

• Fix crash when write HTML comment in markdown
• Fix quotation escape/stringify error, #25
• Fix path process error for externalDemo on Windows, by @Deturium , #27