Add lint rule banning wildcard imports. Fix existing ones where possible.

src/ngx-translate-loaders/translate-server.loader.ts

@@ -1,6 +1,6 @@
 import { TranslateLoader } from '@ngx-translate/core';
 import { Observable, of as observableOf } from 'rxjs';
-import * as fs from 'fs';
+import { readFileSync } from 'fs';
 import { TransferState } from '@angular/platform-browser';
 import { NGX_TRANSLATE_STATE, NgxTranslateState } from './ngx-translate-state';
 
@@ -24,7 +24,7 @@ export class TranslateServerLoader implements TranslateLoader {
    */
   public getTranslation(lang: string): Observable<any> {
     // Retrieve the file for the given language, and parse it
-    const messages = JSON.parse(fs.readFileSync(`${this.prefix}${lang}${this.suffix}`, 'utf8'));
+    const messages = JSON.parse(readFileSync(`${this.prefix}${lang}${this.suffix}`, 'utf8'));
     // Store the parsed messages in the transfer state so they'll be available immediately when the
     // app loads on the client
     this.storeInTransferState(lang, messages);