odbc 1.3.4

• Optimized table preview methods. Enhances large table preview
  within RStudio IDE (@detule, #525).

• Added attributes parameter to dbConnect(...). Can be used to pass a
  token and authenticate against Azure AD when using Microsoft SQL Server.
  Documented in ?ConnectionAttributes (@detule, #521).

• Fix length(x) = 3 > 1' in coercion to 'logical(1) warning in connection
  observer (@meztez, #494).