feat(core): update yarn to 0.20.3

Author: kucharzyk

build.gradle.kts

@@ -84,7 +84,7 @@ configure<IdeaModel>{
 
 configure<NodeExtension> {
   version = "7.5.0"
-  yarnVersion = "0.20.0"
+  yarnVersion = "0.20.3"
   download = true
   workDir = file("${project.buildDir}/nodejs")
   yarnWorkDir = file("${project.buildDir}/yarn")

package.json

@@ -61,7 +61,7 @@
     "ts-node": "2.1.0",
     "tslint": "4.4.2",
     "typescript": "2.1.6",
-    "yarn": "0.20.0"
+    "yarn": "0.20.3"
   },
   "scripts": {
     "clean": "yarn cache clean && rimraf coverage src/main/resources/static/*",

yarn.lock

@@ -6158,9 +6158,9 @@ yargs@~3.10.0:
     decamelize "^1.0.0"
     window-size "0.1.0"
 
-yarn@0.20.0:
-  version "0.20.0"
-  resolved "https://registry.yarnpkg.com/yarn/-/yarn-0.20.0.tgz#1660b0ad49029b874a327fbe832f6504a857ce30"
+yarn@0.20.3:
+  version "0.20.3"
+  resolved "https://registry.yarnpkg.com/yarn/-/yarn-0.20.3.tgz#1031e394721d689ab8c558c67032931bac5b3052"
   dependencies:
     babel-runtime "^6.0.0"
     bytes "^2.4.0"