chore: update lerna & use independent mode

lerna.json

@@ -1,6 +1,9 @@
 {
-  "lerna": "2.5.1",
   "npmClient": "yarn",
   "useWorkspaces": true,
-  "version": "3.0.5"
+  "version": "independent",
+  "packages": [
+    "packages/@vue/*",
+    "packages/vue-cli-version-marker"
+  ]
 }

package.json

@@ -56,7 +56,7 @@
     "http-server": "^0.11.1",
     "inquirer": "^6.0.0",
     "jest": "^23.1.0",
-    "lerna": "^2.8.0",
+    "lerna": "^3.4.3",
     "lint-staged": "^7.2.2",
     "memfs": "^2.8.0",
     "minimist": "^1.2.0",