!16 fix CVE-2021-36386

From: @houyingchao
Reviewed-by: @small_leek
Signed-off-by: @small_leek

fetchmail-6.4.1.tar.xz.asc

@@ -1,16 +0,0 @@
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fetchmail-6.4.20.tar.xz.asc

@@ -0,0 +1,16 @@
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fetchmail.spec

@@ -1,6 +1,6 @@
 Summary:             A remote mail retrieval and forwarding utility
 Name:                fetchmail
-Version:             6.4.1
+Version:             6.4.20
 Release:             1
 URL:                 http://www.fetchmail.info/
 License:             GPL+ and Public Domain
@@ -49,6 +49,9 @@ rm -f $RPM_BUILD_ROOT%{python3_sitelib}/__pycache__/fetchmailconf*
 %config(noreplace) %attr(0600, mail, mail) %{_sysconfdir}/fetchmailrc.example
 
 %changelog
+* Tue Aug 10 2021 houyingchao <houyingchao@huawei.com> - 6.4.21-1
+- Update from 6.4.1 to 6.4.20
+
 * Wed Oct 28 2020 jialei <jialei17@huawei.com> - 6.4.1-1
 - update from 6.3.26 to 6.4.1