+2.3 [2019-01-17]
+ * use the dark-coloured icon by default
+ Thanks to Arnaud Rebillout
+ * bump minimum required version to 57 to guarantee support
+ for all the used features
+
2.2 [2018-09-26]
* remove leading/trailing white-space before evaluating input's
likeliness
add new 'security' color-tag
* add support for clipboard.readText(), available in firefox 63
* provide light and dark icon variants with standard colors
+ * place openlogo-nd.svg in a square document
2.1 [2018-08-22]
* Allow for and trim leading '#' in bug numbers