Adds swift tools version to Package.swift

ggirotto · ggirotto · commit 5f2f6ab8017b · 2021-02-04T17:17:08.000-03:00
diff --git a/Package.swift b/Package.swift
@@ -1,3 +1,4 @@
+// swift-tools-version:5.0
 import PackageDescription
 
 let package = Package(
