Eleventy v3.1.2-beta.4

Installation: npm install @11ty/eleventy@beta --save-exact
Issue Milestone: https://github.com/11ty/eleventy/milestone/50?closed=1
Commit log (from last stable): v3.1.1...v3.1.2-beta.4

• Bug Fix: #3874 Config reset for dev server restart
• Bug Fix: #3875 #1525 numeric tags for collection names