dex-v2.1.1

WHAT'S NEW:

• Customized Help Menu;
• Command changepref is changed to prefix and changepref is added as an alias to it;
• Added a new alias prefspc to the command prefixspace;

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Major Changes

• customized help menu by @code-chaser in #26
• "changepref" to "prefix" & "prefspc" addition by @code-chaser in 099cabe

Full Changelog: v2.1...v2.1.1

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