v4.1.0

⚠️ Breaking change ⚠️ - thanks @Oyvindkg for pointing this out. More info here: #340
This was not intentional, we do intend to follow semver strictly.

• Support making nonce nullable #169 #231 - thanks @FelipeBuiles
• Expose scopes #233
• Add a usePKCE flag #232 - thanks @awmichel
• Fix AppAuth import #245 - thanks @ahood12
• Explicitly add invariant to peer dependencies #246 - thanks @pettyalex
• Fix Android build for newer versions of RN #247 - thanks @rmkpatchaa