Upgrade matrix-js-sdk to 8.4.0-rc.1

package.json

@@ -60,7 +60,7 @@
     "gfm.css": "^1.1.2",
     "highlight.js": "^9.13.1",
     "jsrsasign": "^9.1.5",
-    "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#develop",
+    "matrix-js-sdk": "8.4.0-rc.1",
     "matrix-react-sdk": "github:matrix-org/matrix-react-sdk#develop",
     "olm": "https://packages.matrix.org/npm/olm/olm-3.1.4.tgz",
     "prop-types": "^15.7.2",

yarn.lock

@@ -7341,6 +7341,21 @@ mathml-tag-names@^2.1.1:
   resolved "https://registry.yarnpkg.com/mathml-tag-names/-/mathml-tag-names-2.1.3.tgz#4ddadd67308e780cf16a47685878ee27b736a0a3"
   integrity sha512-APMBEanjybaPzUrfqU0IMU5I0AswKMH7k8OTLs0vvV4KZpExkTkY87nR/zpbuTPj+gARop7aGUbl11pnDfW6xg==
 
+matrix-js-sdk@8.4.0-rc.1:
+  version "8.4.0-rc.1"
+  resolved "https://registry.yarnpkg.com/matrix-js-sdk/-/matrix-js-sdk-8.4.0-rc.1.tgz#9547e6d0088ec22fc6463c3144aee8c03266c215"
+  integrity sha512-u5I8OesrGePVj+NoZByXwV4QBujrMPb4BlKWII4VscvVitLoD/iuz9beNvic3esNF8U3ruWVDcOwA0XQIoumQQ==
+  dependencies:
+    "@babel/runtime" "^7.8.3"
+    another-json "^0.2.0"
+    browser-request "^0.3.3"
+    bs58 "^4.0.1"
+    content-type "^1.0.2"
+    loglevel "^1.6.4"
+    qs "^6.5.2"
+    request "^2.88.0"
+    unhomoglyph "^1.0.2"
+
 "matrix-js-sdk@github:matrix-org/matrix-js-sdk#develop":
   version "8.3.0"
   resolved "https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/b9886d4f3479c041fc6d91ebc88c4a998e9d2e7c"