version 4.5.1

[hvianna]

Minor bugfix release

• Fixes audio context not being properly started in some cases, e.g., when a click event is programmatically triggered before an actual user click;
• Fixes optional bgColor property in the GradientOptions type definition - thanks jgabriel98 for reporting it (#82);
• Adds a demo file for the UMD module.

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This discussion was created from the release version 4.5.1.