chore(): support angular ^7.2.1 and ^8

Author: marcjulian

projects/core/package.json

@@ -15,12 +15,12 @@
     "pwa"
   ],
   "peerDependencies": {
-    "@angular/animations": ">=7.2.1",
-    "@angular/common": ">=7.2.1",
-    "@angular/core": ">=7.2.1",
-    "@angular/forms": ">=7.2.1",
-    "@angular/platform-browser": ">=7.2.1",
-    "@angular/router": ">=7.2.1",
+    "@angular/animations": ">=7.2.1 <9.0.0",
+    "@angular/common": ">=7.2.1 <9.0.0",
+    "@angular/core": ">=7.2.1 <9.0.0",
+    "@angular/forms": ">=7.2.1 <9.0.0",
+    "@angular/platform-browser": ">=7.2.1 <9.0.0",
+    "@angular/router": ">=7.2.1 <9.0.0",
     "@ionic/angular": "^4.0.0",
     "rxjs": ">=6.4.0"
   },