Revert "Avoid linking to connectionstrings.com"

After contacting Max Wikström from connectionstrings.com he was able to
reconfigure their server to respond to the HEAD requests, so we can
re-enable the links now.

This reverts commit fee8225.

Author: jimhester

NAMESPACE

@@ -14,7 +14,6 @@ S3method(odbcDataType,Oracle)
 S3method(odbcDataType,PostgreSQL)
 S3method(odbcDataType,Redshift)
 S3method(odbcDataType,SQLite)
-S3method(odbcDataType,Snowflake)
 S3method(odbcDataType,Teradata)
 S3method(odbcDataType,default)
 S3method(odbcListColumns,OdbcConnection)

R/Driver.R

@@ -75,7 +75,7 @@ setMethod(
 #' The connection string keywords are driver dependent. The parameters
 #' documented here are common, but some drivers may not accept them. Please see
 #' the specific driver documentation for allowed parameters,
-#' 'https://www.connectionstrings.com' is also a useful resource of example
+#' \url{https://www.connectionstrings.com} is also a useful resource of example
 #' connection strings for a variety of databases.
 #' @aliases dbConnect
 #' @export

README.md

@@ -164,7 +164,8 @@ con <- dbConnect(odbc::odbc(),
 ```
 
 Alternatively you can pass a complete connection string as the
-`.connection_string` argument. 'https://www.connectionstrings.com' is a useful resource that
+`.connection_string` argument. [The Connection Strings
+Reference](https://www.connectionstrings.com) is a useful resource that
 has example connection strings for a large variety of databases.
 
 ``` r