fix(package): update @angular/cdk to version 8.1.0

Closes #83

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
   },
   "dependencies": {
     "@angular/animations": "^7.2.10",
-    "@angular/cdk": "^7.3.5",
+    "@angular/cdk": "^8.1.0",
     "@angular/common": "^7.2.10",
     "@angular/core": "^7.2.10",
     "@angular/flex-layout": "^7.0.0-beta.24",