README: Add missing triple back quote

README.md

@@ -189,10 +189,11 @@ from swh.lister.gnu.tasks import gnu_lister
 
 logging.basicConfig(level=logging.DEBUG)
 gnu_lister()
+```
 
 ## lister-cran
 
-Once configured, you can execute a RCRAN lister using the following instructions in a `python3` script:
+Once configured, you can execute a CRAN lister using the following instructions in a `python3` script:
 
 ```lang=python
 import logging
@@ -215,4 +216,4 @@ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 PARTICULAR PURPOSE.  See the GNU General Public License for more details.
 
 See top-level LICENSE file for the full text of the GNU General Public License
-along with this program.
\ No newline at end of file
+along with this program.