Update README.md documentation

README.md

@@ -138,7 +138,7 @@ You can ask also for new databases for references not presented here and for whi
 2. Read de awsome wiki ;)
 3. Create a new issue: Issues > New issue > Describe your issue
 4. Send an email to [nicolas.fernandez@ird.fr](url)
-5. Call me to `+33.(0)4.67.41.55.°°` ; No, don't please ! O_o 
+5. Call me to `+33.(0)4.67.41.55.xx` ; No, don't, please! _O\_o_ 
 
 ## Roadmap ##
 Add new features