Fix spurious false positives on links copied from Word or similar editors. The problem was an invisible Unicode character that was appended to the URL. Apparently Word uses it in documents that contain multiple different languages and/or writing systems.

git-svn-id: https://plugins.svn.wordpress.org/broken-link-checker/trunk@960410 b8457f37-d9ea-0310-8a92-e5e31aec5664