Add swift build options

addSwiftOptions.js

// This file to be added to the <platform name="ios"> tag of your plugin.xml like this:
// <hook type="after_plugin_install" src="hooks/addSwiftOptions.js" />

var fs = require("fs");

module.exports = function (context) {
	var projectRoot = context.opts.projectRoot;
	var xcconfigPath = projectRoot + "/platforms/ios/cordova/build.xcconfig";

	var pluginDir = context.opts.plugin.dir;
	var srcDir = pluginDir + "/src/ios/";

	var swiftOptions = [""]; // <-- begin to file appending AFTER initial newline
	swiftOptions.push("IPHONEOS_DEPLOYMENT_TARGET = 7.0");
	swiftOptions.push("SWIFT_OBJC_BRIDGING_HEADER = " + srcDir + "Bridging-Header.h");

	fs.appendFileSync(xcconfigPath, swiftOptions.join('\n'));
}