Update yarn

Ives van Hoorne · Ives van Hoorne · commit 592156a39cd4 · 2018-07-19T16:56:02.000+01:00
diff --git a/.circleci/config.yml b/.circleci/config.yml
@@ -3,7 +3,7 @@ version: 2
 jobs:
   build-dependencies:
     docker:
-      - image: circleci/node:9
+      - image: circleci/node:10
     working_directory: ~/codesandbox-client
     steps:
       - checkout
