update preact and preact-router

package.json

@@ -24,7 +24,7 @@
     "bootstrap": "yarn install && yarn lerna bootstrap"
   },
   "peerDependencies": {
-    "preact": "^8.1.0"
+    "preact": "^8.5.2"
   },
   "devDependencies": {
     "chai-dom": "^1.4.3",
@@ -36,10 +36,9 @@
     "karma-mocha": "^1.3.0",
     "karma-mocha-reporter": "^2.2.0",
     "karma-rollup-preprocessor": "^7.0.0",
-    "lerna": "^2.8.0",
     "mocha": "^6.0.0",
-    "preact": "^8.1.0",
-    "preact-router": "^2.5.2",
+    "preact": "^8.5.2",
+    "preact-router": "^2.6.1",
     "prettier": "^1.6.1",
     "rollup": "^1.6.0",
     "rollup-plugin-buble": "^0.19.0",