Add explicit :any types to typings
Add explicit :any types to typings

This avoids errors when compiling w/ `noImplicitAny` on:

```
node_modules/node-sync-ipc/index.d.ts(16,9): error TS7010: 'onSync', which lacks return-type annotation, implicitly has an 'any' return type.
node_modules/node-sync-ipc/index.d.ts(16,44): error TS7006: Parameter 'returnValue' implicitly has an 'any' type.
node_modules/node-sync-ipc/index.d.ts(23,9): error TS7010: 'sendSync', which lacks return-type annotation, implicitly has an 'any' return type.
```
MMhunter/node-sync-ipc,MMhunter/node-sync-ipc,MMhunter/node-sync-ipc,MMhunter/node-sync-ipc