fix(package): update @angular/material to version 6.0.2

Closes #305

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "@angular/flex-layout": "2.0.0-beta.9",
     "@angular/forms": "4.3.6",
     "@angular/http": "4.3.6",
-    "@angular/material": "2.0.0-beta.10",
+    "@angular/material": "6.0.2",
     "@angular/platform-browser": "4.3.6",
     "@angular/platform-browser-dynamic": "4.3.6",
     "@angular/router": "4.3.6",