fix(email_validator): handle trailing whitespace in emails (#255)

- Updated email_validator to strip trailing whitespace from emails
  when the `multiple` option is enabled.
- Added a test case to ensure emails with trailing whitespace are
  considered invalid.

lib/valid_email2/email_validator.rb

@@ -57,12 +57,12 @@ def sanitized_values(input)
       options = default_options.merge(self.options)
 
       if options[:multiple]
-        email_list = input.is_a?(Array) ? input : input.split(',')
+        email_list = input.is_a?(Array) ? input : input.split(',').map(&:strip)
       else
         email_list = [input]
       end
 
-      email_list.reject(&:empty?).map(&:strip)
+      email_list.reject(&:empty?)
     end
 
     def error(record, attribute)

spec/valid_email2_spec.rb

@@ -158,6 +158,11 @@ class TestUserMultiple < TestModel
       user = TestUser.new(email: "[email protected]")
       expect(user.valid?).to be_falsy
     end
+
+    it "is invalid with trailing whitespace" do
+      user = TestUser.new(email: "[email protected] ")
+      expect(user.valid?).to be_falsey
+    end
   end
 
   describe "with disposable validation" do