Revert "feature: add update function"

This reverts commit 88785ea.

src/Revenue/Repositories/Revenue.php

@@ -5,6 +5,7 @@
 use Give\Donations\Models\Donation;
 use Give\Framework\Database\DB;
 use Give\Framework\Exceptions\Primitives\InvalidArgumentException;
+use Give\Framework\Support\ValueObjects\Money;
 
 /**
  * Class Revenue
@@ -47,29 +48,6 @@ public function insert($revenueData)
         );
     }
 
-    /**
-     * Update revenue.
-     *
-     * @unreleased
-     *
-     * @return bool|int
-     */
-    public function update(array $revenueData)
-    {
-        global $wpdb;
-
-        // Validate revenue data
-        $this->validateNewRevenueData($revenueData);
-
-        return DB::update(
-            $wpdb->give_revenue,
-            $revenueData,
-            ['donation_id' => $revenueData['donation_id']],
-            ['%d'],
-            ['%d']
-        );
-    }
-
     /**
      * Deletes revenue
      *