Add missing static method for verify on BankAccount (#1418)

lib/stripe/resources/bank_account.rb

@@ -20,8 +20,21 @@ def self.object_name
     end
 
     def verify(params = {}, opts = {})
-      resp, opts = execute_resource_request(:post, resource_url + "/verify", params, opts)
-      initialize_from(resp.data, opts)
+      request_stripe_object(
+        method: :post,
+        path: "#{Customer.resource_url}/#{customer}/sources/#{id}/verify",
+        params: params,
+        opts: opts
+      )
+    end
+
+    def self.verify(customer, id, params = {}, opts = {})
+      request_stripe_object(
+        method: :post,
+        path: "#{Customer.resource_url}/#{customer}/sources/#{id}/verify",
+        params: params,
+        opts: opts
+      )
     end
 
     def resource_url

test/stripe/bank_account_test.rb

@@ -30,6 +30,14 @@ class BankAccountTest < Test::Unit::TestCase
                                                           id: "ba_123")
         bank_account = bank_account.verify(amounts: [1, 2])
         assert bank_account.is_a?(Stripe::BankAccount)
+        assert_requested :post, "#{Stripe.api_base}/v1/customers/cus_123/sources/ba_123/verify"
+      end
+
+      should "verify the account using the static method" do
+        bank_account = Stripe::BankAccount.verify("cus_123",
+                                                  "ba_123", amounts: [1, 2])
+        assert bank_account.is_a?(Stripe::BankAccount)
+        assert_requested :post, "#{Stripe.api_base}/v1/customers/cus_123/sources/ba_123/verify"
       end
     end
   end