Add a message saying the bot is open-source

commands/about.js

@@ -29,6 +29,10 @@ const aboutBot = function (c) {
     })
   }
   c.reply({ text: '' })
+  c.reply({
+    text: getMessage(c.lang, 'command.about.license'),
+    color: c.colors.secondary
+  })
   c.reply({
     translate: getMessage(c.lang, 'command.about.sourceCode'),
     color: c.colors.secondary,

lang/en-US.json

@@ -48,6 +48,7 @@
 	"command.about.version": "Version %s",
 	"command.about.preRelease": "This is a development version - there may be errors, and features may be changed or removed at any time. Please report any errors to the bot's developer.",
 	"command.about.sourceCode": "Source code: %s",
+	"command.about.license": "This bot is free and open-source software and is available under the terms of the MIT license.",
 	"command.about.sourceCode.openInBrowser": "Click to open the source code link in your default browser",
 	"command.cloop.error.tooShort": "Command loops must have a rate above 20ms.",
 	"command.cloop.error.subcommand": "Unknown subcommand, please do %s",