Fix a SimpleForm 3.1.0 deprecation warning

DEPRECATION WARNING: input method now accepts a `wrapper_options` argument. The method definition without the argument is deprecated and will be removed in the next Simple Form version. Change your code from:

    def input

to

    def input(wrapper_options)

See heartcombo/simple_form#997 for more information.
 (called from block in _app_views_tips_new_html_haml__844955797404246493_70326972009780 at /Users/dimitar/projects/fmi/evans/app/views/tips/new.html.haml:6)

app/inputs/date_time_input.rb

@@ -1,7 +1,7 @@
 class DateTimeInput < SimpleForm::Inputs::Base
   FORMAT = '%Y-%m-%d %H:%M:%S'
 
-  def input
+  def input(wrapper_options)
     timestamp = @builder.object.send(attribute_name)
     formatted = timestamp.try(:strftime, FORMAT)
 

app/inputs/markdown_input.rb

@@ -1,5 +1,5 @@
 class MarkdownInput < SimpleForm::Inputs::TextInput
-  def input
+  def input(wrapper_options)
     content = @builder.object.send(attribute_name) || ''
     input_html_options['data-contribution-input'] = true