fix(deps): Add support for RxJS 6

BREAKING CHANGE:

Minimum dependency on RxJS is ^5.6.0-forward-compat.0 || ^6.0.0-rc.1

lib/task.js

@@ -1,7 +1,7 @@
 'use strict';
 const isPromise = require('is-promise');
 const streamToObservable = require('stream-to-observable');
-const Subject = require('rxjs/Subject').Subject;
+const Subject = require('rxjs').Subject;
 const renderer = require('./renderer');
 const state = require('./state');
 const utils = require('./utils');
@@ -10,7 +10,6 @@ const ListrError = require('./listr-error');
 const defaultSkipFn = () => false;
 
 class Task extends Subject {
-
 	constructor(listr, task, options) {
 		super();
 

package.json

@@ -51,7 +51,7 @@
     "log-update": "^1.0.2",
     "ora": "^0.2.3",
     "p-map": "^1.1.1",
-    "rxjs": "^5.4.2",
+    "rxjs": "^5.6.0-forward-compat.0 || ^6.0.0-rc.0",
     "stream-to-observable": "^0.2.0",
     "strip-ansi": "^3.0.1"
   },

test/output.js

@@ -1,5 +1,5 @@
 import test from 'ava';
-import {Observable} from 'rxjs/Observable';
+import {Observable} from 'rxjs';
 import Listr from '../';
 import SimpleRenderer from './fixtures/simple-renderer';
 import {testOutput} from './fixtures/utils';

test/tty.js

@@ -1,5 +1,5 @@
 import test from 'ava';
-import {Observable} from 'rxjs/Observable';
+import {Observable} from 'rxjs';
 import Listr from '../';
 import SimpleRenderer from './fixtures/simple-renderer';
 import TTYRenderer from './fixtures/tty-renderer';

test/utils.js

@@ -1,5 +1,5 @@
 import test from 'ava';
-import {Observable as RxObservable} from 'rxjs/Observable';
+import {Observable as RxObservable} from 'rxjs';
 import ZenObservable from 'zen-observable';
 import Listr from '../';
 import {isListr, isObservable} from '../lib/utils';