README.md: a markup link fix and use the canonical URL for Fossil.
FossilOrigin-Name: c49bfee6b878bd96adfc852fdc76e98bf81e2fb82be8325672fbc7af04e7dffa
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stephan committed
5b5625f679aa130d5a16204bc06ce7e99b2f869f
Parent: 59b1711