pnpm 5.10.1 on Node.js NPM

A "pnpm"."overrides" field may be used to override version ranges of dependencies. #2946
The overrides field can be specified only in the root project's package.json.
An example of the "pnpm"."overrides" field:
```
{
  "pnpm": {
    "overrides": {
      "foo": "^1.0.0",
      "bar@^2.1.0": "3.0.0",
      "qar@1>zoo": "2"
    }
  }
}
```
You may specify the package to which the overriden dependency belongs by separating the package selector from the dependency selector with a ">". For example qar@1>zoo will only override the zoo dependency of any qar@1 dependency.
A new setting added for specifying the shell to use, when running scripts: script-shell #2942
When some of the dependencies of a package have the package as a peer depenendency (for instance, some of the dependencies of webpack have webpack as peer dependency), don't make the dependency a peer depenendency of itself.
Lockfile version bumped to 5.2