Release 11 new icons and 11 updated icons (v4.15.0)

New Icons

• Amazon S3 (#4999)
• Commerzbank (#5028)
• DatoCMS (#5184)
• Enpass (#5174)
• Hyper (#5197)
• Mercurial (#5157)
• Pointy (#4952)
• Private Internet Access (#5158)
• Stimulus (#5209)
• SymPy (#4554)
• XState (#4971)

Updated Icons

• AlliedModders (#5107)
• Code Climate (#5194)
• Elsevier (#5175)
• Firefox (#5203)
• Git (#5213)
• Google Ads (#4471)
• Monzo (#5219)
• Notepad++ (#5187)
• pre-commit (#5226)
• SparkFun (#5196)
• Stack Overflow (#5217)