fix(package.json): Adding postinstall script (#13)

* fix(package.json): added postinstall script

* build(docker): added date-fns package copy

Author: rallysson

Dockerfile

@@ -1,6 +1,7 @@
 FROM mhart/alpine-node:10
 WORKDIR /usr/src
 COPY package.json yarn.lock /usr/src/
+COPY date-fns-v2/package.json yarn.lock /usr/src/date-fns-v2/
 RUN yarn install
 COPY . .
 RUN yarn storybook:build

package.json

@@ -11,6 +11,7 @@
     "lint": "kcd-scripts lint",
     "precommit": "kcd-scripts precommit",
     "predeploy": "npm run storybook:build",
+    "postinstall": "cd date-fns-v2/ && npm install",
     "semantic-release": "semantic-release",
     "storybook": "start-storybook -p 9001 -c stories",
     "storybook:build": "build-storybook -c stories",