Fix little typo in documentation

Author: sailro

README.rst

@@ -194,7 +194,7 @@ Documentation
                      In no-regex mode, may be a comma-separated list.
                      Escape (\,) for a literal comma (may require \\, in shell).
       --incl=<f>     Included files [default: .*]. See `--excl` for format.
-      --since=<date>  Date from which to check. Can be absoulte (eg: 1970-01-31)
+      --since=<date>  Date from which to check. Can be absolute (eg: 1970-01-31)
                       or relative to now (eg: 3.weeks).
       --until=<date>  Date to which to check. See `--since` for format.
       --cost=<method>  Include time cost in person-months (COCOMO) or