Update README.md

Adding a link to the macOS installation instructions.
2018-02-07 10:40:37 -08:00 · 2018-02-07 10:40:37 -08:00 · a175248d41
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 brew formulae for
  - Microsoft ODBC Driver for SQL Server
  - SQL Server Command Line Utilities
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+For macOS installation instructions, see the [Microsoft ODBC Driver for SQL Server documentation](https://docs.microsoft.com/en-us/sql/connect/odbc/linux-mac/installing-the-microsoft-odbc-driver-for-sql-server#os-x-1011-el-capitan-and-macos-1012-sierra).