Upgrade matrix-js-sdk to 15.1.0-rc.1

package.json

@@ -60,7 +60,7 @@
     "gfm.css": "^1.1.2",
     "jsrsasign": "^10.2.0",
     "katex": "^0.12.0",
-    "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#develop",
+    "matrix-js-sdk": "15.1.0-rc.1",
     "matrix-react-sdk": "github:matrix-org/matrix-react-sdk#develop",
     "matrix-widget-api": "^0.1.0-beta.17",
     "prop-types": "^15.7.2",

yarn.lock

@@ -7854,6 +7854,22 @@ mathml-tag-names@^2.1.3:
   resolved "https://registry.yarnpkg.com/mathml-tag-names/-/mathml-tag-names-2.1.3.tgz#4ddadd67308e780cf16a47685878ee27b736a0a3"
   integrity sha512-APMBEanjybaPzUrfqU0IMU5I0AswKMH7k8OTLs0vvV4KZpExkTkY87nR/zpbuTPj+gARop7aGUbl11pnDfW6xg==
 
+matrix-js-sdk@15.1.0-rc.1:
+  version "15.1.0-rc.1"
+  resolved "https://registry.yarnpkg.com/matrix-js-sdk/-/matrix-js-sdk-15.1.0-rc.1.tgz#1271e10b30f6f37cf74f9a722718c75014224797"
+  integrity sha512-sjUHp9Fs+vhl0seUXrjWCvTV6qD9voPAEt9gOuBs3N+25ps+Exd86mKQ+BWQ/nIz+zM4Tg6AOls90JvfILvazg==
+  dependencies:
+    "@babel/runtime" "^7.12.5"
+    another-json "^0.2.0"
+    browser-request "^0.3.3"
+    bs58 "^4.0.1"
+    content-type "^1.0.4"
+    loglevel "^1.7.1"
+    p-retry "^4.5.0"
+    qs "^6.9.6"
+    request "^2.88.2"
+    unhomoglyph "^1.0.6"
+
 "matrix-js-sdk@github:matrix-org/matrix-js-sdk#develop":
   version "15.0.0"
   resolved "https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/f0091fa81149eed4fd2d0d82be7b820238cd5a1a"