Set OSX v10_13 as new minimum platform version per discussion: https://forums.swift.org/t/spm-support-basic-auth-for-non-git-binary-dependency-hosts/37878/10?u=sstadelman

sstadelman · sstadelman · commit 015aed41e195 · 2020-08-11T08:07:16.000-07:00
diff --git a/Package.swift b/Package.swift
@@ -15,6 +15,7 @@ import PackageDescription
 
 let package = Package(
     name: "swift-tools-support-core",
+    platforms: [.macOS(.v10_13)],
     products: [
         .library(
             name: "SwiftToolsSupport",
