Update config.yml

Author: leecalcote

.github/config.yml

@@ -17,7 +17,7 @@ newPRWelcomeComment: >
 firstPRMergeComment: >
   Thanks for your contribution to the Layer5 community! :tada:
    
-  ![Congrats!](/../.github/welcome/Layer5-celebration.png)
+  ![Congrats!](/../master/.github/welcome/Layer5-celebration.png)
 
 
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