feat(api-client): rxjs 6 compatible import for Observable

Author: vmasek

package.json

@@ -25,6 +25,7 @@
   "keywords": [
     "swagger",
     "rest",
+    "angular6",
     "angular5",
     "angular4",
     "angular",

templates/ngx-service.mustache

@@ -2,7 +2,7 @@
 
 import { HttpClient, HttpHeaders, HttpParams } from '@angular/common/http';
 import { Inject, Injectable, InjectionToken, Optional } from '@angular/core';
-import { Observable } from 'rxjs/Observable';
+import { Observable } from 'rxjs';
 import { HttpOptions } from './';
 
 {{#definitions.length}}

tests/esquare/api/api-client.service.ts

@@ -2,7 +2,7 @@
 
 import { HttpClient, HttpHeaders, HttpParams } from '@angular/common/http';
 import { Inject, Injectable, InjectionToken, Optional } from '@angular/core';
-import { Observable } from 'rxjs/Observable';
+import { Observable } from 'rxjs';
 import { HttpOptions } from './';
 
 import * as models from './models';

tests/gcloud-firestore/api/api-client.service.ts

@@ -2,7 +2,7 @@
 
 import { HttpClient, HttpHeaders, HttpParams } from '@angular/common/http';
 import { Inject, Injectable, InjectionToken, Optional } from '@angular/core';
-import { Observable } from 'rxjs/Observable';
+import { Observable } from 'rxjs';
 import { HttpOptions } from './';
 
 import * as models from './models';

tests/github/api/api-client.service.ts

@@ -2,7 +2,7 @@
 
 import { HttpClient, HttpHeaders, HttpParams } from '@angular/common/http';
 import { Inject, Injectable, InjectionToken, Optional } from '@angular/core';
-import { Observable } from 'rxjs/Observable';
+import { Observable } from 'rxjs';
 import { HttpOptions } from './';
 
 import * as models from './models';