update yarn version

Author: Matthias Rütten

.travis.yml

@@ -3,7 +3,7 @@ sudo: false
 language: node_js
 
 before_install:
-  - curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version 1.17.3
+  - curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version 1.19.1
   - export PATH=$HOME/.yarn/bin:$PATH
 
 install:

package.json

@@ -4,7 +4,7 @@
   "description": "This app shows your merge requests grouped by projects and WIP status. It is accessible from the system tray.",
   "main": "./dist/main.js",
   "engines": {
-    "yarn": "1.17.3"
+    "yarn": "1.19.1"
   },
   "homepage": "https://github.com/codecentric/merge-request-notifier",
   "author": {