build: update to yarn 0.21.3 (#14805)

circle.yml

@@ -5,6 +5,7 @@ machine:
 dependencies:
   pre:
     - npm install -g npm@3.10.7
+    - curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version 0.21.3
 
 test:
   override:

package.json

@@ -10,7 +10,7 @@
   "engines": {
     "node": ">=6.9.5 <7.0.0",
     "npm": ">=3.10.7 <4.0.0",
-    "yarn": ">=0.19.1 <0.21.0"
+    "yarn": ">=0.21.3 <0.22.0"
   },
   "repository": {
     "type": "git",

scripts/ci-lite/env.sh

@@ -6,7 +6,7 @@ echo 'travis_fold:start:ENV'
 
 NODE_VERSION=6.9.5
 NPM_VERSION=3.10.7 # do not upgrade to >3.10.8 unless https://github.com/npm/npm/issues/14042 is resolved
-YARN_VERSION=0.19.1
+YARN_VERSION=0.21.3
 CHROMIUM_VERSION=433059 # Chrome 56 linux stable, see https://www.chromium.org/developers/calendar
 SAUCE_CONNECT_VERSION=4.3.11