Added upgrade doc

gnikyt · May 17, 2018 · 35c9fd4 · 35c9fd4
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+# Upgrading
+
+# v1.x.x -> v2.0.0
+
+Library is no longer a single class. It now has a namespace with several classes.
+
+Old:
+
+```php
+use OhMyBrew\BasicShopifyAPI;
+
+$api = new BasicShopifyAPI(...);
+```
+
+New:
+
+```php
+
+use OhMyBrew\ShopifyAPI;
+
+$api = new RestAPI(...);
+```
+
+A GraphQL API class is now also included, use `GraphAPI`.