update changelog date

chinyeungli · chinyeungli · commit 45d7cb6622ed · 2020-09-01T18:25:44.000+08:00
diff --git a/docs/CHANGELOG.rst b/docs/CHANGELOG.rst
@@ -1,4 +1,4 @@
-2020-xx-xx
+2020-09-01
     Release 5.1.0
 
     * Add support for `package_url` #396
