Bump version up to 0.8.1

Author: liberostelios

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ninja",
-  "version": "0.8.0",
+  "version": "0.8.1",
   "private": true,
   "scripts": {
     "start": "parcel public/index.html",

src/App.vue

@@ -650,7 +650,7 @@
                   class="card-link"
                   href="https://github.com/cityjson/ninja"
                   target="_blank"
-                ><i class="fab fa-github"></i> ninja v0.8.0</a>
+                ><i class="fab fa-github"></i> ninja v0.8.1</a>
               </div>
             </div>
           </div>