Fix: Empty file will be downloaded (#3)

Author: ottijp

README.adoc

@@ -37,7 +37,7 @@ To generate new Pkl sources, first install the Swift code generator:
 
 [source,bash]
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-curl https://github.com/apple/pkl-swift/releases/download/0.7.0/pkl-gen-swift-macos.bin -o pkl-gen-swift
+curl -L https://github.com/apple/pkl-swift/releases/download/0.7.0/pkl-gen-swift-macos.bin -o pkl-gen-swift
 chmod +x pkl-gen-swift
 ----