Upgrading to mem-fs@^4.0.0

[RCVarley]

I'm not sure of the proper way to go about changes like this, but yeoman 5 ([email protected]) has a dependency of mem-fs@^4.0.0, which causes unmet peer dependencies. Is it possible to add support for v4 without breaking other libraries?

 WARN  Issues with peer dependencies found
.
├─┬ @yeoman/types 1.4.0
│ └── ✕ unmet peer mem-fs@^3.0.0: found 4.1.0
└─┬ generator-generator 5.1.0
  └─┬ generator-node 2.8.0
    └─┬ generator-license 5.7.0
      └─┬ yeoman-generator 5.10.0
        └─┬ mem-fs-editor 9.7.0
          └── ✕ unmet peer mem-fs@^2.1.0: found 4.1.0