Adds YAML to dev dependencies and improves README and test changes pe…

…r review comment

README.md

@@ -313,11 +313,9 @@ i18n.configure({
     disable: false
   },
 
-  // Parse file contents with a YAML parser
-  // The parser can be any object that responds to .parse & .stringify
-  parser: YAML
+  // Parser can be any object that responds to .parse & .stringify
+  parser: JSON
 })
-
 ```
 
 The locale itself is gathered directly from the browser by header, cookie or query parameter depending on your setup.
@@ -380,6 +378,18 @@ i18n.configure({
 
 **NOTE:** Enabling `staticCatalog` disables all other fs realated options such as `updateFiles`,  `autoReload` and `syncFiles`
 
+#### Some words on `parser` option
+
+Instead of parsing all file contents as JSON, you can parse them as YAML or any other format you like
+```js
+const YAML = require('yaml')
+
+i18n.configure({
+  extension: '.yml',
+  parser: YAML
+})
+```
+
 ### i18n.init()
 
 When used as middleware in frameworks like express to setup the current environment for each loop. In contrast to configure the `i18n.init()` should be called within each request-response-cycle.

package.json

@@ -52,6 +52,7 @@
     "prettier": "^2.5.1",
     "should": "^13.2.3",
     "sinon": "^12.0.1",
+    "yaml": "^1.10.2",
     "zombie": "^6.1.4"
   },
   "engines": {

test/i18n.configureParser.js

@@ -1,23 +1,22 @@
-const i18n = require('..')
-const should = require('should')
+const { I18n } = require('..')
 const YAML = require('yaml')
+require('should')
 
 describe('configure parser', function () {
-  context('with YAML parser', () => {
-    i18n.configure({
+  context('with YAML parser', function () {
+    const i18n = new I18n({
       locales: ['en', 'de'],
       parser: YAML
     })
 
     it('should parse the locale files with the YAML parser', function () {
-      should.equal(i18n.__('Hello'), 'Hello')
+      i18n.__('Hello').should.equal('Hello')
     })
 
     it('should write unknown keys to the catalog', function () {
       i18n.__('does.not.exist')
 
-      var catalog = i18n.getCatalog()
-      catalog.should.have.property('does.not.exist', 'does.not.exist')
+      i18n.getCatalog().should.have.property('does.not.exist', 'does.not.exist')
     })
   })
 })