feat: add methods for first and last block (#84)

src/API/Blocks.php

@@ -44,6 +44,26 @@ public function show(string $id): array
         return $this->get("blocks/{$id}");
     }
 
+    /**
+     * Get the first block.
+     *
+     * @return array
+     */
+    public function first(): array
+    {
+        return $this->get('blocks/first');
+    }
+
+    /**
+     * Get the last block.
+     *
+     * @return array
+     */
+    public function last(): array
+    {
+        return $this->get('blocks/last');
+    }
+
     /**
      * Get all transactions by the given block.
      *

tests/API/BlocksTest.php

@@ -39,6 +39,22 @@ public function show_calls_correct_url()
         });
     }
 
+    /** @test */
+    public function first_calls_correct_url()
+    {
+        $this->assertResponse('GET', 'blocks/first', function ($connection) {
+            return $connection->blocks()->first();
+        });
+    }
+
+    /** @test */
+    public function last_calls_correct_url()
+    {
+        $this->assertResponse('GET', 'blocks/last', function ($connection) {
+            return $connection->blocks()->last();
+        });
+    }
+
     /** @test */
     public function transactions_calls_correct_url()
     {