Credit Command

commands/number-edit/gravity.js

@@ -10,6 +10,12 @@ module.exports = class GravityCommand extends Command {
 			memberName: 'gravity',
 			description: 'Determines weight on another planet.',
 			details: `**Planets:** ${Object.keys(planets).join(', ')}`,
+			credit: [
+				{
+					name: 'Planetary Fact Sheet - Ratio to Earth Values',
+					url: 'https://nssdc.gsfc.nasa.gov/planetary/factsheet/planet_table_ratio.html'
+				}
+			],
 			args: [
 				{
 					key: 'weight',