fix(c): fix incomplete error message for timestamp too small

Close #521.

diff --git a/psycopg_c/psycopg_c/types/datetime.pyx b/psycopg_c/psycopg_c/types/datetime.pyx
index 51e7dcf9be6d2239efd4143a82c42908b72cc898..3b6fd1f18406b35faa53336efb00b0f150894909 100644 (file)
--- a/psycopg_c/psycopg_c/types/datetime.pyx
+++ b/psycopg_c/psycopg_c/types/datetime.pyx
@@ -1073,7 +1073,7 @@ cdef object _get_timestamp_load_error(
             return len(s.split()[-1]) > 4  # year is last token
 
     if s == "-infinity" or s.endswith("BC"):
-        return e.DataError("timestamp too small (before year 1): {s!r}")
+        return e.DataError(f"timestamp too small (before year 1): {s!r}")
     elif s == "infinity" or is_overflow(s):
         return e.DataError(f"timestamp too large (after year 10K): {s!r}")
     else: