Fixed typo in breadcrumbs file

20_12_02_README.md

 The Cloudy project subversion repository and its history
 2020 Dec 2
 
-This Git repository is a tip migration of a subversion repository which has our history going back about fifteen years. The subversion repository is maintained as a read-only read-only reference at
+This Git repository is a tip migration of a subversion repository which has our history going back about fifteen years. The subversion repository is maintained as a read-only reference at
 https://viewvc.nublado.org          or
 https://trac.nublado.org/browser