Update lintian override to match old lintian I guess?

Author: terceiro

debian/source/lintian-overrides

@@ -1,3 +1,4 @@
 source-contains-prebuilt-ms-help-file
 # There is no RFC text
+license-problem-non-free-RFC .bundle/gems/net-imap-0.4.9.1/LICENSE.txt
 license-problem-non-free-RFC [.bundle/gems/net-imap-0.4.9.1/LICENSE.txt]