Set latest release to 1.5.1 (#973)

Author: ararslan

config.md

@@ -10,9 +10,9 @@
 @def author = ""
 
 <!-- Templating of the Downloads -->
-@def stable_release = "1.5.0"
+@def stable_release = "1.5.1"
 @def stable_release_short = "1.5"
-@def stable_release_date = "Aug 1, 2020"
+@def stable_release_date = "Aug 25, 2020"
 @def lts_release = "1.0.5"
 @def lts_release_short = "1.0"
 @def lts_release_date = "Sep 9, 2019"