refactor: gatsby-browser, gatsby-node

adds .eslintcache to gitignore

gatsby-node.js

@@ -1,22 +1,22 @@
-var rucksack = require('rucksack-css')
-var lost = require("lost")
-var cssnext = require("postcss-cssnext")
+const rucksack = require('rucksack-css');
+const lost = require('lost');
+const cssnext = require('postcss-cssnext');
 
-exports.modifyWebpackConfig = function(config, env) {
-    config.merge({
-        postcss: [
-            lost(),
-            rucksack(),
-            cssnext({
-                browsers: ['>1%', 'last 2 versions']
-            })
-        ]
-    })
+exports.modifyWebpackConfig = function (config) {
+  config.merge({
+    postcss: [
+      lost(),
+      rucksack(),
+      cssnext({
+        browsers: ['>1%', 'last 2 versions'],
+      }),
+    ],
+  });
 
-    config.loader('svg', {
-       test: /\.(svg)(\?v=[0-9]\.[0-9]\.[0-9])?$/,
-       loader: 'file-loader',
-    })
+  config.loader('svg', {
+    test: /\.(svg)(\?v=[0-9]\.[0-9]\.[0-9])?$/,
+    loader: 'file-loader',
+  });
 
-    return config
-};
+  return config;
+};