Merge pull request #39 from xefi/issue-74

Add Ucfirst modifier

Author: martinsoenen

content/1.getting-started/6.modifiers.md

@@ -51,3 +51,15 @@ $faker = new Faker();
 
 $faker->uppercase()->sentence(); // MY SENTENCE UPPERCASED
 ```
+
+## Ucfirst
+
+Put your string in capitalize:
+
+```php
+use Xefi\Faker\Faker;
+
+$faker = new Faker();
+
+$faker->ucfirst()->sentence(); // My sentence capitalized
+```