Change peerDependencies versions

[A-gambit]

No description provided.

[blacktaxi]

Looks like we need to wait for @types/react-dom to receive an update – currently it comes with its own dependency of @types/react@15.0.38 which conflicts with our local @types/react@16.0.7.

[oleksiilevzhynskyi]

@blacktaxi @A-gambit react-dom already in sync with react, so we can update it.

Also, let's update rxjs up to 5.5.6. Changes from 4.5.3...5.5.6 contain fixes to bunch of issues when errors in subscribe were silently swallowed.

• fix(Observable): Another attempt at fixing error rethrows in v5 ReactiveX/rxjs#3161
• Errors being trapped by merge operations like switchMaps ReactiveX/rxjs#3183
• https://jsbin.com/ribeyeyolo/edit?html,js,console

[oleksiilevzhynskyi]

Looks like there is an issue with the 15.x version that causes typing issues - https://goo.gl/prc6Mq. @types/react-dom@15.5.1 has a dependency to @types.react* that resolves to @types.react@16.0.3 even so, there is @types/react@15.0.38 in package.json.
It can be fixed by "resolutions" key in package.json

"resolutions": {
 "@types/react": "15.0.38"
}

But, in that case, 16.x version would be broken.

@blacktaxi Do we really need to support 15.x version?