updated readme

Author: Zack Teska

README.md

@@ -105,4 +105,19 @@ $address->toArray();
     '204 SE Smith St',
     'Harrisburg, OR 97446'
   ]
-```
+```
+
+### Hashing
+If you only need to make use of a consistent way of hashing (e.g. if you're starting with a dependable 5-part address, such as from a 3rd party service), you can build a `SimpleAddress`.
+
+```php
+<?php
+use ZeroDaHero\SimpleAddress;
+
+$address = new SimpleAddress('1234 Main St NE', null, 'Minneapolis', 'MN', '55401');
+$address->getHash(); // full hash minus zip
+$address->getFullHash(); // full hash including zip
+
+// CANNOT hash street, since the component parts don't exist
+$address->getStreetHash(); // throws exception
+```

tests/SimpleAddressTest.php

@@ -19,6 +19,6 @@ public function testHashesAddress()
         $this->assertEquals('c4ced80b9489911b4a66712470833242597aa032', $address->getFullHash());
 
         $this->expectException(AddressNotNormalizedException::class);
-        $this->assertEquals('f7f77f11493cccb50c5827dff7cb8b26d31f8442', $address->getStreetHash());
+        $address->getStreetHash();
     }
 }