pep8: Fix E301 pep8 violations.

Fix "E301: expected (1 or 2) blank line" pep8 violations.

zerver/lib/parallel.py

@@ -58,6 +58,7 @@ if __name__ == "__main__":
     import time
     jobs = [10, 19, 18, 6, 14, 12, 8, 2, 1, 13, 3, 17, 9, 11, 5, 16, 7, 15, 4]
     expected_output = [6, 10, 12, 2, 1, 14, 8, 3, 18, 19, 5, 9, 13, 11, 4, 7, 17, 16, 15]
+
     def wait_and_print(x):
         # type: (int) -> int
         time.sleep(x * 0.1)