Fix naturaldelta truncating years instead of rounding (#295)

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>

Author: ArmaanjeetSandhu

src/humanize/time.py

@@ -256,6 +256,7 @@ def naturaldelta(
 
         return _ngettext("1 year, %d day", "1 year, %d days", days) % days
 
+    years = round(delta.days / 365)
     return _ngettext("%d year", "%d years", years).replace("%d", "%s") % intcomma(years)
 
 

tests/test_time.py

@@ -127,6 +127,11 @@ def test_naturaldelta_nomonths(test_input: dt.timedelta, expected: str) -> None:
         (dt.timedelta(days=9), "9 days"),
         (dt.timedelta(days=365), "a year"),
         (dt.timedelta(days=365 * 1_141), "1,141 years"),
+        (dt.timedelta(days=365 * 2), "2 years"),
+        (dt.timedelta(days=365 * 2.4), "2 years"),
+        (dt.timedelta(days=365 * 2.6), "3 years"),
+        (dt.timedelta(days=365 * 2.9), "3 years"),
+        (dt.timedelta(days=365 * 3), "3 years"),
         ("NaN", "NaN"),  # Returns non-numbers unchanged.
         # largest possible timedelta
         (dt.timedelta(days=999_999_999), "2,739,726 years"),