Bump react & react-dom to v16.6.3

This fix a context problem that was preventing UpdateNotifier to
correctly update. Feel free to ping me if you want me to show you.

package.json

@@ -75,8 +75,8 @@
     "qs": "^6.5.1",
     "raven": "^2.5.0",
     "raven-js": "^3.24.2",
-    "react": "^16.6.1",
-    "react-dom": "^16.4.1",
+    "react": "^16.6.3",
+    "react-dom": "^16.6.3",
     "react-i18next": "^7.7.0",
     "react-key-handler": "^1.0.1",
     "react-markdown": "^3.3.2",

yarn.lock

@@ -13188,15 +13188,15 @@ react-docgen@^3.0.0-beta11:
     node-dir "^0.1.10"
     recast "^0.12.6"
 
-react-dom@^16.4.1:
-  version "16.4.1"
-  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.4.1.tgz#7f8b0223b3a5fbe205116c56deb85de32685dad6"
-  integrity sha512-1Gin+wghF/7gl4Cqcvr1DxFX2Osz7ugxSwl6gBqCMpdrxHjIFUS7GYxrFftZ9Ln44FHw0JxCFD9YtZsrbR5/4A==
+react-dom@^16.6.3:
+  version "16.6.3"
+  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.6.3.tgz#8fa7ba6883c85211b8da2d0efeffc9d3825cccc0"
+  integrity sha512-8ugJWRCWLGXy+7PmNh8WJz3g1TaTUt1XyoIcFN+x0Zbkoz+KKdUyx1AQLYJdbFXjuF41Nmjn5+j//rxvhFjgSQ==
   dependencies:
-    fbjs "^0.8.16"
     loose-envify "^1.1.0"
     object-assign "^4.1.1"
-    prop-types "^15.6.0"
+    prop-types "^15.6.2"
+    scheduler "^0.11.2"
 
 react-error-overlay@^4.0.0:
   version "4.0.0"
@@ -13474,7 +13474,7 @@ react-treebeard@^2.1.0:
     shallowequal "^0.2.2"
     velocity-react "^1.3.1"
 
-react@*, react@^16.2.0, react@^16.6.1:
+react@*, react@^16.2.0:
   version "16.6.1"
   resolved "https://registry.yarnpkg.com/react/-/react-16.6.1.tgz#ee2aef4f0a09e494594882029821049772f915fe"
   integrity sha512-OtawJThYlvRgm9BXK+xTL7BIlDx8vv21j+fbQDjRRUyok6y7NyjlweGorielTahLZHYIdKUoK2Dp9ByVWuMqxw==
@@ -13484,6 +13484,16 @@ react@*, react@^16.2.0, react@^16.6.1:
     prop-types "^15.6.2"
     scheduler "^0.11.0"
 
+react@^16.6.3:
+  version "16.6.3"
+  resolved "https://registry.yarnpkg.com/react/-/react-16.6.3.tgz#25d77c91911d6bbdd23db41e70fb094cc1e0871c"
+  integrity sha512-zCvmH2vbEolgKxtqXL2wmGCUxUyNheYn/C+PD1YAjfxHC54+MhdruyhO7QieQrYsYeTxrn93PM2y0jRH1zEExw==
+  dependencies:
+    loose-envify "^1.1.0"
+    object-assign "^4.1.1"
+    prop-types "^15.6.2"
+    scheduler "^0.11.2"
+
 reactcss@^1.2.0:
   version "1.2.3"
   resolved "https://registry.yarnpkg.com/reactcss/-/reactcss-1.2.3.tgz#c00013875e557b1cf0dfd9a368a1c3dab3b548dd"
@@ -14389,6 +14399,14 @@ scheduler@^0.11.0:
     loose-envify "^1.1.0"
     object-assign "^4.1.1"
 
+scheduler@^0.11.2:
+  version "0.11.3"
+  resolved "https://registry.yarnpkg.com/scheduler/-/scheduler-0.11.3.tgz#b5769b90cf8b1464f3f3cfcafe8e3cd7555a2d6b"
+  integrity sha512-i9X9VRRVZDd3xZw10NY5Z2cVMbdYg6gqFecfj79USv1CFN+YrJ3gIPRKf1qlY+Sxly4djoKdfx1T+m9dnRB8kQ==
+  dependencies:
+    loose-envify "^1.1.0"
+    object-assign "^4.1.1"
+
 schema-utils@^0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/schema-utils/-/schema-utils-0.3.0.tgz#f5877222ce3e931edae039f17eb3716e7137f8cf"