Update v8.1.3 changelog (#9737)

The v8.1.3 changelog has been updated with all user-facing changes
included with v8.1.3

PR #9612 was left under "Current Develop Branch" because it has been
temporarily reverted for this release. It was added there now so that
we don't forget about it, as the revert might result in that commit
not being populated by the changelog script for the next release.

CHANGELOG.md

@@ -1,8 +1,21 @@
 # Changelog
 
 ## Current Develop Branch
+- [#9612](https://github.com/MetaMask/metamask-extension/pull/9612): Update main-quote-summary designs/styles
 
 ## 8.1.3 Mon Oct 26 2020
+- [#9642](https://github.com/MetaMask/metamask-extension/pull/9642) Prevent excessive overflow from swap dropdowns
+- [#9658](https://github.com/MetaMask/metamask-extension/pull/9658): Fix sorting Quote Source column of quote sort list
+- [#9667](https://github.com/MetaMask/metamask-extension/pull/9667): Fix adding contact with QR code
+- [#9674](https://github.com/MetaMask/metamask-extension/pull/9674): Fix ENS resolution of `.eth` URLs with query strings
+- [#9691](https://github.com/MetaMask/metamask-extension/pull/9691): Bump @metamask/inpage-provider from 6.1.0 to 6.3.0
+- [#9700](https://github.com/MetaMask/metamask-extension/pull/9700): Provide image sizing so there's no jump when opening the swaps token search
+- [#9568](https://github.com/MetaMask/metamask-extension/pull/9568): Add ses lockdown to build system
+- [#9705](https://github.com/MetaMask/metamask-extension/pull/9705): Prevent memory leak from selected account copy tooltip
+- [#9671](https://github.com/MetaMask/metamask-extension/pull/9671): Prevent old fetches from polluting the swap state
+- [#9702](https://github.com/MetaMask/metamask-extension/pull/9702): Keyboard navigation for swaps dropdowns
+- [#9646](https://github.com/MetaMask/metamask-extension/pull/9646): Switch from Matomo to Segment
+- [#9726](https://github.com/MetaMask/metamask-extension/pull/9726): Fix fetching of swap quotes when initial network was testnet
 
 ## 8.1.2 Mon Oct 19 2020
 - [#9608](https://github.com/MetaMask/metamask-extension/pull/9608): Ensure QR code scanner works