Configure lerna with yarn workspaces

.yarnrc

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+workspaces-experimental true

lerna.json

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+{
+  "lerna": "3.4.2",
+  "version": "3.0.0",
+  "npmClient": "yarn",
+  "useWorkspaces": true
+}

package.json

@@ -0,0 +1,11 @@
+{
+  "private": true,
+  "devDependencies": {
+    "lerna": "3.4.2"
+  },
+  "scripts": {
+  },
+  "workspaces": [
+    "packages/*"
+  ]
+}