Upgrade stdlib.

Author: mbostock

yarn.lock

@@ -26,9 +26,9 @@
     esm "^3.0.84"
 
 "@observablehq/stdlib@^3.0.0":
-  version "3.0.4"
-  resolved "https://registry.yarnpkg.com/@observablehq/stdlib/-/stdlib-3.0.4.tgz#12be3fa9ffc611608e85f39d04f920ed1d119acd"
-  integrity sha512-5550y5NFIZMnXoq1s9hdE8rEN7cn55TrZoGABCxmL/N9sHwHlmw/CPDWTb60NzBcQpNfL1lYlCIAZryal8rfrg==
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/@observablehq/stdlib/-/stdlib-3.1.0.tgz#b98836c3cf204e0909761360b331ae00e7e051d8"
+  integrity sha512-pNWYE8WoWbD206vXQv39BroX9scKLkXnUlIVistVxFaGTwKdMSe0PlMKC3Kb+Pb8NGjYNctvFwZLestKqx2lqA==
   dependencies:
     d3-require "^1.2.0"
     esm "^3.0.84"
@@ -1517,9 +1517,9 @@ rollup-pluginutils@^2.8.1:
     estree-walker "^0.6.1"
 
 rollup@^1.20.0:
-  version "1.20.0"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-1.20.0.tgz#3799e4cd2f48c0a068d87af575956d8d72c9447a"
-  integrity sha512-zW80j9RSJ0VV0VOxP1i7cF279+IlAaD49Ihwqb87PDR0555Fvk10HKmh2yUtXCdBb37bELuhHWZTJc4uoCo8Vw==
+  version "1.20.1"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-1.20.1.tgz#fc66f356c5afbd7c62434f1e7a53a1e7da5a2b32"
+  integrity sha512-8DV8eWLq84fbJFRqkjWg8BWX4NTTdHpx9bxjmTl/83z54o6Ygo1OgUDjJGFq/xe5i0kDspnbjzw2V+ZPXD/BrQ==
   dependencies:
     "@types/estree" "0.0.39"
     "@types/node" "^12.7.2"