Remove "dist" directory on yarn build

package.json

@@ -8,7 +8,7 @@
   "description": "hive.blog is the koa web server & middleware and react.js in-browser code for the world's first blockchain content + social media monetization platform!",
   "main": "index.js",
   "scripts": {
-    "build": "NODE_ENV=production webpack --config ./webpack/prod.config.js && rm -rf ./lib && babel src --out-dir lib -D",
+    "build": "rm -rf ./dist && NODE_ENV=production webpack --config ./webpack/prod.config.js && rm -rf ./lib && babel src --out-dir lib -D",
     "test": "jest -c src/test/unit/jest.config.js",
     "eslint": "LIST=`git diff-index --diff-filter=ACMR --name-only HEAD | grep .*\\.js | grep -v json`; if [ \"$LIST\" ]; then eslint $LIST; fi",
     "eslint:fix": "LIST=`git diff-index --diff-filter=ACMR --name-only HEAD | grep .*\\.js | grep -v json`; if [ \"$LIST\" ]; then eslint --fix $LIST; fi",