Consolidate versions from both download sites #73
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Starting with Xcode 11 beta 6, developer.apple.com/download and developer.apple.com/download/more both list (some) pre-release versions of Xcode. Previously, pre-release versions only appeared on developer.apple.com/download. /download/more doesn't include build numbers, so we trust that if the version number and prerelease identifiers are the same as one on /download then they're the same build. If an Xcode version is listed on both sites then we prefer the one on /download because the build metadata is used later to compare against installed Xcodes.
Because pre-release versions that are installed also have build metadata, but this won't be the case for pre-release versions listed on /download/more, we also need to replace versions that are available with the installed ones with build metadata before printing them.
Resolves #67
Testing
Before:
After: