Use lower-case letters for github URLs.

This makes it a little more consistent; now, "cretonne" is never capitalized
in identifier, path, or URL contexts. It is capitalized in natural
language contexts when referring to the project.

cranelift/publish-all.sh

@@ -31,4 +31,4 @@ for crate in entity codegen frontend native reader wasm ; do
     echo cargo publish --manifest-path "lib/$crate/Cargo.toml"
 done
 echo
-echo Then, go to https://github.com/Cretonne/cretonne/releases/ and define a new release.
+echo Then, go to https://github.com/cretonne/cretonne/releases/ and define a new release.