add charset requirement about DB, refer to issue #208
@ -36,7 +36,7 @@ Prerequisite
---
- Node.js 4.x or up (test up to 6.7.0)
- Database (PostgreSQL, MySQL, MariaDB, SQLite, MSSQL)
- Database (PostgreSQL, MySQL, MariaDB, SQLite, MSSQL) use charset `utf8`
- npm and bower
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