Fix build process

electron/application.json

@@ -6,7 +6,7 @@
   "main": "main.js",
   "license": "MIT",
   "devDependencies": {
-    "electron": "^1.8.0"
+    "electron": "^1.8.1"
   },
   "dependencies": {
     "keytar": "^4.0.4",

electron/webpack.config.js

@@ -75,6 +75,7 @@ module.exports = function(env) {
     const themes = fs.readdirSync(themesDir);
     const cssOptions = {use: [{loader: 'css-loader', options: {minimize: dist}}, 'less-loader']};
     for(const theme of themes) {
+        if(!theme.endsWith('.less')) continue;
         const absPath = path.join(themesDir, theme);
         config.entry.chat.push(absPath);
         const plugin = new ExtractTextPlugin('themes/' + theme.slice(0, -5) + '.css');