fix(package): update @angular/pwa to version 0.800.4

Closes #57

Author: greenkeeper[bot]

package.json

@@ -46,7 +46,7 @@
 		"@angular/material-moment-adapter": "8.0.0",
 		"@angular/platform-browser": "8.0.0",
 		"@angular/platform-browser-dynamic": "8.0.0",
-		"@angular/pwa": "0.800.0",
+		"@angular/pwa": "0.800.4",
 		"@angular/router": "8.0.0",
 		"@angular/service-worker": "8.0.0",
 		"@fortawesome/angular-fontawesome": "^0.4.0",