Show version number in about dialog (#28)

build/version2file.js

@@ -0,0 +1,13 @@
+#!/usr/bin/node
+
+// This script extracts the version number from wails.json in the project root
+// and writes it to version.txt
+
+const fs = require('fs');
+
+fs.writeFileSync(
+  __dirname+'/version.txt',
+  JSON.parse(
+    fs.readFileSync(__dirname+'/../wails.json')
+  ).info.productVersion
+);