Remove deprecated code [#3120796]

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  Line   tweetext.install                                                  
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  16     Call to deprecated function libraries_get_path():                 
         Will be removed before a stable Drupal 8 release. Please use the  
         new library load and managment concepts described at:             
         https://www.drupal.org/node/2170763                               
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  Line   tweetext.module                                                       
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  22     Call to deprecated method url() of class Drupal:                      
         as of Drupal 8.0.x, will be removed before Drupal 9.0.0.              
         Instead create a \Drupal\Core\Url object directly, for example using  
         Url::fromRoute().                                                     
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 [ERROR] Found 2 errors