changing form yarn to npm

package.json

@@ -22,17 +22,17 @@
         "compile:electron:watch": "./node_modules/.bin/tsc -p electron --watch",
         "lint": "./node_modules/.bin/ng lint",
         "package": "node ./electron-build.js",
-        "postinstall": "cd electron && yarn install",
+        "postinstall": "cd electron && npm install",
         "serve": "./node_modules/.bin/ng serve",
         "start:electron": "./node_modules/.bin/electron ./electron",
-        "test": "yarn run test:electron && yarn run test:angular && yarn run test:spectron",
+        "test": "npm run test:electron && npm run test:angular && npm run test:spectron",
         "test:angular": "./node_modules/.bin/ng test --watch false --no-progress",
         "test:angular:watch": "./node_modules/.bin/ng test",
         "test:spectron": "node ./node_modules/mocha/bin/_mocha --timeout 20000 -r ts-node/register --bail --ui bdd ./spectron/**/*.func.ts",
         "test:electron": "./node_modules/electron/cli.js ./electron/node_modules/mocha/bin/_mocha --timeout 15000 -r ts-node/register --recursive --ui bdd 'electron/**/*.spec.ts'",
-        "ci": "yarn run build && yarn run test:spectron && yarn run test:electron && yarn run test:angular",
+        "ci": "npm run build && npm run test:spectron && npm run test:electron && npm run test:angular",
         "i18n": "ng-xi18n",
-        "ci:concurrently": "./node_modules/.bin/concurrently --kill-others-on-fail 'yarn run build && yarn run test:spectron' 'yarn run test:electron' 'yarn run test:angular'"
+        "ci:concurrently": "./node_modules/.bin/concurrently --kill-others-on-fail 'npm run build && npm run test:spectron' 'npm run test:electron' 'npm run test:angular'"
     },
     "private": true,
     "dependencies": {