PHP errors and warnings.

Hello,
Can you please fix the following deprecated code cauing errors and warnings:

FILE: wp-content/plugins/username-changer/vendor/widgitlabs/simple-settings/class-simple-settings.php
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FOUND 21 ERRORS AND 21 WARNINGS AFFECTING 21 LINES
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  160 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_settings_page'}
  160 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
  350 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_sections'}
  350 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
  373 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_options'}
  373 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
  414 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_options'}
  414 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
  436 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_options'}
  436 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
  576 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_options'}
  576 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
  830 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_options'}
  830 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
  858 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_options'}
  858 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
  908 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_options'}
  908 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
  960 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_options'}
  960 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
  990 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_options'}
  990 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
 1031 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_options'}
 1031 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
 1068 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_options'}
 1068 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
 1100 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_options'}
 1100 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
 1141 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_options'}
 1141 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
 1191 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_options'}
 1191 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
 1221 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_options'}
 1221 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
 1256 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_options'}
 1256 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
 1286 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_options'}
 1286 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
 1319 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_options'}
 1319 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.
 1383 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$this->func . '_settings_page'}
 1383 | ERROR   | "$this" can no longer be used with the "global" keyword since PHP 7.1.