do not exclude Clones from transpilation

scripts/upgradeable/transpile.sh

@@ -6,9 +6,10 @@ npm run compile
 
 # -D: delete original and excluded files
 # -i: use included Initializable
-# -x: exclude all proxy contracts
+# -x: exclude all proxy contracts except Clones library
 # -p: emit public initializer
 npx @openzeppelin/upgrade-safe-transpiler -D \
   -i contracts/proxy/Initializable.sol \
   -x 'contracts/proxy/**/*' \
+  -x '!contracts/proxy/Clones.sol' \
   -p 'contracts/presets/**/*'