Update repo from which RODBCext is found and add tar.gz (#62)

* Update repo from which RODBCext is found

* Add tar.gz for linux

R/buildandinstall.cmd

@@ -1,6 +1,8 @@
 pushd .
 cd ..
-R -e "install.packages('RODBCext', repos='https://cran.microsoft.com')"
+R -e "install.packages('RODBCext', repos='https://mran.microsoft.com/snapshot/2019-02-01/')"
 R CMD INSTALL --build R
+R CMD INSTALL --build R sqlmlutils.tar.gz
 mv sqlmlutils_*.zip R/dist
+mv sqlmlutils_*.tar.gz R/dist
 popd