fix: support angular 8

Author: scttcper

src/lib/package.json

@@ -7,8 +7,8 @@
   },
   "version": "0.0.0-placeholder",
   "peerDependencies": {
-    "@angular/core": "^5.2.0 || ^6.0.0 || ^7.0.0",
-    "@angular/platform-browser": "^5.2.0 || ^6.0.0 || ^7.0.0"
+    "@angular/core": "^6.0.0 || ^7.0.0 || ^8.0.0",
+    "@angular/platform-browser": "^6.0.0 || ^7.0.0 || ^8.0.0"
   },
   "repository": "typectrl/ngx-csv",
   "homepage": "https://github.com/typectrl/ngx-csv",