ci: fix incorrect script

Author: igorkamyshev

package.json

@@ -8,7 +8,7 @@
     "build:styleguide": "styleguidist build",
     "build:lib": "gulp",
     "ci": "yarn s lint",
-    "prepare": "install-self-peers -- --ignore-scripts && build:lib",
+    "prepare": "install-self-peers -- --ignore-scripts && yarn build:lib",
     "s": "yarn soda"
   },
   "dependencies": {