mem-fs needs to be added to dependencies

[ntucker]

Type of issue

It's a peerdep of both yeoman/environment and mem-fs-editor.

---

My environment

• OS version/details: eg. Windows 10 64-bit
• Node version: x.x.x (run node --version in your terminal)
• npm version: x.x.x (run npm --version in your terminal)
• Version of yo : x.x.x (run yo --version in your terminal)

Expected behavior

Current behavior

Steps to reproduce the behavior

Command line output

Paste your error output over here

[JoshuaKGoldberg]

yo doesn't itself use mem-fs. That's up to individual generators. If another package uses mem-fs without declaring an explicit dependency on it, that package should have a bug reported on it directly. Cheers! 🎩