Support updating customer emails

https://developer.helpscout.com/mailbox-api/endpoints/customers/emails/update/

lib/help_scout/customer.rb

@@ -47,5 +47,11 @@ def initialize(params = {})
 
       @hrefs = HelpScout::Util.map_links(params[:_links])
     end
+
+    def update_email(email_id, new_email, type: :other)
+      email_path = "#{URI.parse(hrefs[:self]).path}/emails/#{email_id}"
+      HelpScout.api.put(email_path, { type: type, value: new_email })
+      true
+    end
   end
 end

spec/integration/customer_spec.rb

@@ -10,10 +10,22 @@
   include_examples 'listable integration'
 
   describe 'list' do
-    it "finds customers filtered with query" do
+    it 'finds customers filtered with query' do
       result = described_class.list(query: '(email="[email protected]")')
+
       expect(result).to be_a Array
       expect(result).to all(be_a(described_class))
     end
   end
+
+  describe '#update_email' do
+    it 'updates the customer email' do
+      customer = described_class.get(id)
+      original_email = customer.emails.first
+      new_email = "changed#{original_email[:value]}"
+
+      expect(customer.update_email(original_email[:id], new_email, type: original_email[:type])).to be_truthy
+      expect(described_class.get(id).emails.first[:value]).to eq(new_email)
+    end
+  end
 end