Upgrade Preact

This fixes an issue with `Fragment`s containing a conditionally-rendered
last child.

package.json

@@ -90,7 +90,7 @@
     "npm-packlist": "^1.1.12",
     "postcss": "^7.0.13",
     "postcss-url": "^8.0.0",
-    "preact": "10.0.0-beta.0",
+    "preact": "10.0.0-beta.1",
     "prettier": "1.17.0",
     "query-string": "^3.0.1",
     "raf": "^3.1.0",

yarn.lock

@@ -7619,10 +7619,10 @@ preact-render-to-string@^4.1.0:
   dependencies:
     pretty-format "^3.8.0"
 
-preact@10.0.0-beta.0:
-  version "10.0.0-beta.0"
-  resolved "https://registry.yarnpkg.com/preact/-/preact-10.0.0-beta.0.tgz#8d53947b167449c09a678fefc2085c0f56ed34bd"
-  integrity sha512-BKd77y7ZpPLybjtM35DJtzXj+sxlAt29MCMGOJnSrsv1jt30aE/wS9qoU9nL8ih+yhal3B22mGAvuh2mGLAFMg==
+preact@10.0.0-beta.1:
+  version "10.0.0-beta.1"
+  resolved "https://registry.yarnpkg.com/preact/-/preact-10.0.0-beta.1.tgz#f7d524668db72ed74e99d447f09600fa4db0b186"
+  integrity sha512-1uhj3JXOEzEPUof5t/iQW5heEvTOpexwS0FLAjJQfgfT8OCXICyzI2TwkYyFJ+W9q9GsDmhZgFagH2G0akFveQ==
 
 prelude-ls@~1.1.2:
   version "1.1.2"