patch 8.0.0510: typo in link to codecov.io results

Problem:    Typo in link to codecov.io results.
Solution:   Remove duplicate https:.
diff --git a/src/version.c b/src/version.c
index cb02f47..08adb69 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    510,
+/**/
     509,
 /**/
     508,