update readme.txt

git-svn-id: https://plugins.svn.wordpress.org/tax-rate-upload/trunk@822159 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt

git-svn-id: https://plugins.svn.wordpress.org/tax-rate-upload/trunk@822163 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt

git-svn-id: https://plugins.svn.wordpress.org/tax-rate-upload/trunk@822166 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt

git-svn-id: https://plugins.svn.wordpress.org/tax-rate-upload/trunk@822170 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt

git-svn-id: https://plugins.svn.wordpress.org/tax-rate-upload/trunk@822171 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt

git-svn-id: https://plugins.svn.wordpress.org/tax-rate-upload/trunk@822173 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt

git-svn-id: https://plugins.svn.wordpress.org/tax-rate-upload/trunk@822175 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt

git-svn-id: https://plugins.svn.wordpress.org/tax-rate-upload/trunk@822176 b8457f37-d9ea-0310-8a92-e5e31aec5664
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git-svn-id: https://plugins.svn.wordpress.org/tax-rate-upload/trunk@822189 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt

git-svn-id: https://plugins.svn.wordpress.org/tax-rate-upload/trunk@822190 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt

git-svn-id: https://plugins.svn.wordpress.org/tax-rate-upload/trunk@822191 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt

git-svn-id: https://plugins.svn.wordpress.org/tax-rate-upload/trunk@822208 b8457f37-d9ea-0310-8a92-e5e31aec5664