Merge pull request #14 from krzyzanowskim/master

Requires macOS 10.14

Author: tanner0101

Package.swift

@@ -4,7 +4,7 @@ import PackageDescription
 let package = Package(
     name: "Mustache",
     platforms: [
-       .macOS(.v10_15)
+       .macOS(.v10_14)
     ],
     products: [
         .library(name: "Mustache", targets: ["Mustache"]),