chore(package.json): update deps to angular 7

Author: Neonox31

projects/ngx-openlayers/package.json

@@ -8,8 +8,8 @@
     "postchangelog": "cp projects/ngx-openlayers/CHANGELOG.md dist/ngx-openlayers/CHANGELOG.md"
   },
   "peerDependencies": {
-    "@angular/common": "^6.0.0-rc.0 || ^6.0.0",
-    "@angular/core": "^6.0.0-rc.0 || ^6.0.0"
+    "@angular/common": "^6.0.0-rc.0 || ^6.0.0 || ^7.0.0",
+    "@angular/core": "^6.0.0-rc.0 || ^6.0.0 || ^7.0.0"
   },
   "dependencies": {
     "@types/openlayers": "4.3.x || 4.4.x",