use object spread (#216)

lib/module.js

@@ -5,7 +5,7 @@ const logger = consola.withScope('nuxt:axios')
 
 function axiosModule(_moduleOptions) {
   // Combine options
-  const moduleOptions = Object.assign({}, this.options.axios, _moduleOptions)
+  const moduleOptions = { ...this.options.axios, ..._moduleOptions }
 
   // Default port
   const defaultPort =
@@ -32,8 +32,7 @@ function axiosModule(_moduleOptions) {
   const prefix = process.env.API_PREFIX || moduleOptions.prefix || '/'
 
   // Apply defaults
-  const options = Object.assign(
-    {
+  const options = {
     baseURL: `http://${defaultHost}:${defaultPort}${prefix}`,
     browserBaseURL: null,
     credentials: false,
@@ -43,10 +42,9 @@ function axiosModule(_moduleOptions) {
     proxyHeadersIgnore: ['accept', 'host', 'cf-ray', 'cf-connecting-ip'],
     proxy: false,
     retry: false,
-      https: false
-    },
-    moduleOptions
-  )
+    https: false,
+    ...moduleOptions
+  }
 
   // ENV overrides