WP_DEBUG message when I activated the plugin

Hi, I just tried your plugin for the latest WordPress version. I had wp_debug true for a moment and when I tried to activate your plugin WP_DEBUG shown this errors. (Btw, i’m using php 5.6.3 of xampp.)

Strict Standards: Only variables should be passed by reference in /opt/lampp/htdocs/yrh/wp-content/plugins/gd-taxonomies-tools/gd-taxonomies-tools.php on line 154

Strict Standards: Declaration of gdttWalker_Terms::start_el() should be compatible with Walker_Category::start_el(&$output, $category, $depth = 0, $args = Array, $id = 0) in /opt/lampp/htdocs/yrh/wp-content/plugins/gd-taxonomies-tools/code/fnc/display.php on line 60

Strict Standards: Declaration of gdttWalker_TermsDropdown::start_el() should be compatible with Walker_CategoryDropdown::start_el(&$output, $category, $depth = 0, $args = Array, $id = 0) in /opt/lampp/htdocs/yrh/wp-content/plugins/gd-taxonomies-tools/code/fnc/display.php on line 79

I’m not using the plugin for any projects yet I just wanted to let you guys know.

https://wordpress.org/plugins/gd-taxonomies-tools/