Fix 404 meta URL

Author: zoffixznet

META.list

@@ -373,7 +373,7 @@ https://raw.githubusercontent.com/hoelzro/p6-algorithm-elo/master/META6.json
 https://raw.githubusercontent.com/jaffa4/Dependency-Sort/master/META6.json
 https://raw.githubusercontent.com/jaffa4/inistorage/master/META6.json
 https://raw.githubusercontent.com/jonathanstowe/Audio-Encode-LameMP3/master/META6.json
-https://raw.githubusercontent.com/sylvarant/Avro/master/META.json
+https://raw.githubusercontent.com/sylvarant/Avro/master/META6.json
 https://raw.githubusercontent.com/jaffa4/logd/master/META6.json
 https://raw.githubusercontent.com/jaffa4/string-stream/master/META6.json
 https://raw.githubusercontent.com/jonathanstowe/NativeHelpers-Array/master/META6.json