Refactor api-promise/rx (#566)

* Use a generic abstract OnCall

* Add OnCall for Promise

* First run at fixing extrinsics

* Fix types

* Make submittable extrinsic work

* Move file

* Make derive work

* Fix types

* Only call metadata once

* Make tests pass

* Put event emitter in apirx

* Fix small bugs

* Fix tests

* Fix bug decorateStorage

* Make tests pass for tx

* Move rpc base to apirx

* Fix lint

* Fix small bugs

* Fix bug with isSubscription

* Fix codeclimate

* Revert

* Add tslint disable line

* Fix lint

* Skip e2e

* Typo

* Lint

* Re-add combinator back

* Add ._rx in Base

* Make extrinsics work

* Update derivex

* Fix bug lint

* Fix circular dep

* Fix bug e2e

* Remove useless check

* Add description comment

* Clean stuff

* Move assert to Base

* Bump version, update CHANGELOG

* Make _rx private

* Private emit

packages/rpc-rx/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/rpc-rx",
-  "version": "0.39.12",
+  "version": "0.40.0",
   "description": "An RxJs wrapper around the Polkadot JS API",
   "main": "index.js",
   "keywords": [
@@ -30,8 +30,8 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/rpc-rx#readme",
   "dependencies": {
     "@babel/runtime": "^7.2.0",
-    "@polkadot/rpc-core": "^0.39.12",
-    "@polkadot/rpc-provider": "^0.39.12",
+    "@polkadot/rpc-core": "^0.40.0",
+    "@polkadot/rpc-provider": "^0.40.0",
     "@types/rx": "^4.1.1",
     "rxjs": "^6.3.3"
   }