build: introduce support for minor beta releases

Author: mgechev

package.json

@@ -92,8 +92,8 @@
     "zone.js": "^0.9.0"
   },
   "peerDependencies": {
-    "@angular/compiler": ">=2.3.1 <9.0.0 || >8.0.0-beta <9.0.0",
-    "@angular/core": ">=2.3.1 <9.0.0 || >8.0.0-beta <9.0.0",
+    "@angular/compiler": ">=2.3.1 <9.0.0 || >8.0.0-beta <9.0.0 || >8.1.0-beta <9.0.0 || >8.2.0-beta <9.0.0",
+    "@angular/core": ">=2.3.1 <9.0.0 || >8.0.0-beta <9.0.0 || >8.1.0-beta <9.0.0 || >8.2.0-beta <9.0.0",
     "tslint": "^5.0.0"
   },
   "dependencies": {