Bump bolt version and add cloud run example

google-cloud-run/.dockerignore

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+Dockerfile
+README.md
+node_modules
+npm-debug.log

google-cloud-run/Dockerfile

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+# Use the official lightweight Node.js 12 image.
+# https://hub.docker.com/_/node
+FROM node:12-slim
+
+# Create and change to the app directory.
+WORKDIR /usr/src/app
+
+# Copy application dependency manifests to the container image.
+# A wildcard is used to ensure both package.json AND package-lock.json are copied.
+# Copying this separately prevents re-running npm install on every code change.
+COPY package*.json ./
+
+# Install production dependencies.
+RUN npm install --only=production
+
+# Copy local code to the container image.
+COPY . ./
+
+# Run the web service on container startup.
+CMD [ "npm", "start" ]

google-cloud-run/README.md

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+# Japan Weather Radar Map (雨雲レーダー) on Slack
+
+This is a working example app which displays Japan weather radar maps on Slack. This application is built with [Bolt⚡️](https://github.com/SlackAPI/bolt) and [Yahoo! JAPAN Static Map API (雨雲レーダー表示)](https://developer.yahoo.co.jp/webapi/map/openlocalplatform/v1/static.html#exp_weather).
+
+[![Deploy](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy?template=https://github.com/seratch/slack-weather-radar-map/tree/master)
+
+## `/amesh {prefecture name}`
+
+This command posts an animated GIF showing the forecasting weather map.
+
+<img src="https://raw.githubusercontent.com/seratch/slack-weather-radar-map/master/images/demo_amesh_hiroshima.gif" height=400/>
+
+## `/amesh {prefecture name} now`
+
+This command instantly posts the present moment image.
+
+<img src="https://raw.githubusercontent.com/seratch/slack-weather-radar-map/master/images/demo_amesh_tokyo_now.gif" height=400/>
+
+## `/amesh {prefecture name} today`
+
+This command posts the transition of weather map in the last 24 hours.
+
+<img src="https://raw.githubusercontent.com/seratch/slack-weather-radar-map/master/images/demo_amesh_okinawa_today.gif" height=400/>
+
+## Map Mode
+
+https://developer.yahoo.co.jp/webapi/map/openlocalplatform/v1/static.html#request-param
+
+The defualt map mode is `map`. If you'd like to customize the appearance, set `YAHOO_JAPAN_API_MAP_MODE` env variable with either of the following values.
+
+* map - 通常の地図
+* photo - 航空写真
+* map-b1 - 地下街
+* hd - ハイビジョン地図
+* hybrid - ハイブリッド地図
+* blankmap - 白地図
+* osm - Open Street Map
+
+Here is the output with `hybrid` mode.
+
+<img src="https://raw.githubusercontent.com/seratch/slack-weather-radar-map/master/images/demo_amesh_fukuoka_hybrid_mode.gif" height=300/>
+
+## How to run this app
+
+### Create a Slack App
+
+https://api.slack.com/apps
+
+* Features > OAuth & Permissions:
+  * Scopes:
+    * "bot"
+    * "commands"
+    * "files:write:user"
+  * Click "Save Changes"
+* Features > Slash Commands:
+  * Click "Create New Command"
+    * Command
+      * Set `/amesh`
+    * Request URL
+      * Set `https://{your app name}.herokuapp.com/slack/events`
+    * Short Description
+      * Set something helpful for users
+    * Click "Save"
+* Features > Bot User:
+  * Click "Add a Bot User"
+  * Click "Add Bot User"
+* Settings > Install App:
+  * Complete "Install App"
+
+### Run the app on your laptop
+
+```bash
+# prep
+nvm use 10.13.0 # Bolt runs on Node 10.13+
+cp -p _env .env
+vi .env
+source .env
+npm i
+
+# run the app
+npm run local
+
+# on another terminal window
+ngrok http 3000
+```
+
+### Deploy to Google Cloud Run
+
+```
+gcloud config set project ${GCLOUD_PROJECT_ID}
+gcloud config set run/region asia-northeast1
+
+gcloud builds submit --tag gcr.io/${GCLOUD_PROJECT_ID}/weather-radar
+
+export GCLOUD_PROJECT_ID={something-great-12345}
+export SLACK_SIGNING_SECRET={abcabcabcabcabcbabc}
+export SLACK_BOT_TOKEN={xoxb-1234123412-123412341212-abcabcabc}
+export YAHOO_JAPAN_API_CLIENT_ID={abcabcabcabcabcabcabcabcabcabcabcabc}
+
+gcloud beta run deploy weather-radar \
+  --image gcr.io/${GCLOUD_PROJECT_ID}/weather-radar \
+  --platform managed \
+  --update-env-vars \
+SLASH_COMMAND_NAME=tenki,\
+SLACK_SIGNING_SECRET=${SLACK_SIGNING_SECRET},\
+SLACK_BOT_TOKEN=${SLACK_BOT_TOKEN},\
+YAHOO_JAPAN_API_CLIENT_ID=${YAHOO_JAPAN_API_CLIENT_ID},\
+YAHOO_JAPAN_API_MAP_MODE-=map,\
+TZ=Asia/Tokyo
+```
+
+```
+$ gcloud beta run deploy weather-radar \
+>   --image gcr.io/${GCLOUD_PROJECT_ID}/weather-radar \
+>   --platform managed \
+>   --update-env-vars \
+> SLASH_COMMAND_NAME=tenki,\
+> SLACK_SIGNING_SECRET=${SLACK_SIGNING_SECRET},\
+> SLACK_BOT_TOKEN=${SLACK_BOT_TOKEN},\
+> YAHOO_JAPAN_API_CLIENT_ID=${YAHOO_JAPAN_API_CLIENT_ID},\
+> YAHOO_JAPAN_API_MAP_MODE-=map,\
+> TZ=Asia/Tokyo
+
+Deploying container to Cloud Run service [weather-radar] in project [something-great-12345] region [asia-northeast1]
+✓ Deploying... Done.
+  ✓ Creating Revision...
+  ✓ Routing traffic...
+Done.
+
+Service [weather-radar] revision [weather-radar-********] has been deployed and is serving 100 percent of traffic at https://weather-radar-********-an.a.run.app
+````