fix firebird logo url 
fix firebird logo url 

![Firebird Logo](https://firebirdsql.org/file/about/firebird-logo-90.png)
xdenser/node-firebird-libfbclient,xdenser/node-firebird-libfbclient,xdenser/node-firebird-libfbclient,xdenser/node-firebird-libfbclient