Add migration script

tools/migration/node.2018-03-13.othello.js

+// for Node.js interpret
+
+const { default: Othello } = require('../../built/api/models/othello-game')
+const { default: zip } = require('@prezzemolo/zip')
+
+const migrate = async (doc) => {
+	const x = {};
+
+	doc.logs.forEach(log => {
+		log.color = log.color == 'black';
+	});
+
+	const result = await Othello.update(doc._id, {
+		$set: doc.logs
+	});
+
+	return result.ok === 1;
+}
+
+async function main() {
+
+	const count = await Othello.count({});
+
+	const dop = Number.parseInt(process.argv[2]) || 5
+	const idop = ((count - (count % dop)) / dop) + 1
+
+	return zip(
+		1,
+		async (time) => {
+			console.log(`${time} / ${idop}`)
+			const doc = await Othello.find({}, {
+				limit: dop, skip: time * dop
+			})
+			return Promise.all(doc.map(migrate))
+		},
+		idop
+	).then(a => {
+		const rv = []
+		a.forEach(e => rv.push(...e))
+		return rv
+	})
+}
+
+main().then(console.dir).catch(console.error)