Let 'shards update' sort the shard.lock file

shard.lock

@@ -1,5 +1,9 @@
 version: 2.0
 shards:
+  ameba:
+    git: https://github.com/crystal-ameba/ameba.git
+    version: 0.14.3
+
   athena-negotiation:
     git: https://github.com/athena-framework/negotiation.git
     version: 0.1.1
@@ -47,7 +51,3 @@ shards:
   sqlite3:
     git: https://github.com/crystal-lang/crystal-sqlite3.git
     version: 0.19.0
-
-  ameba:
-    git: https://github.com/crystal-ameba/ameba.git
-    version: 0.14.3