RMariaDB 1.0.11

Features

• Windows: update to libmariadbclient 3.1.11
• Add timezone argument to dbConnect() (#184, @ycphs).
• dbWriteTable() and dbBind() correctly interpret difftime values with units other than "secs".

Internal

• ./configure no longer requires bash (@jeroen).
• Switch to GitHub Actions (#185, thanks @ankane).