change npm to yarn

Author: jack

package.json

@@ -6,11 +6,11 @@
   "types": "./lib/index.d.ts",
   "bin": "./lib/cli.js",
   "scripts": {
-    "pretest": "npm run build",
+    "pretest": "yarn build",
     "test": "jest --bail",
     "lint": "tslint -p tslint.json && tsc --noEmit",
     "build": "del-cli \"./lib/*\" && tsc",
-    "prepack": "npm run lint && npm run test"
+    "prepack": "yarn lint && yarn test"
   },
   "repository": {
     "type": "git",

yarn.lock

@@ -2737,16 +2737,6 @@ lodash@^4.13.1, lodash@^4.17.10, lodash@^4.17.13, lodash@^4.17.4:
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.13.tgz#0bdc3a6adc873d2f4e0c4bac285df91b64fc7b93"
   integrity sha512-vm3/XWXfWtRua0FkUyEHBZy8kCPjErNBT9fJx8Zvs+U6zjqPbTUOpkaoum3O5uiA8sm+yNMHXfYkTUHFoMxFNA==
 
-lodash@^4.17.15:
-  version "4.17.15"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.15.tgz#b447f6670a0455bbfeedd11392eff330ea097548"
-  integrity sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==
-
-lodash@^4.17.15:
-  version "4.17.15"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.15.tgz#b447f6670a0455bbfeedd11392eff330ea097548"
-  integrity sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==
-
 loose-envify@^1.0.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/loose-envify/-/loose-envify-1.4.0.tgz#71ee51fa7be4caec1a63839f7e682d8132d30caf"