style: leverage one more arrow function

echo.js

@@ -0,0 +1 @@
+console.log(JSON.stringify(process.env, null, 2));

package.json

@@ -20,7 +20,7 @@
     "install-on-your-machine": "npm pack && sudo npm i -g $(find . -name 'nprr-*.tgz') && sudo -k && rm $(find . -name 'nprr-*.tgz')",
     "// TESTS ////////////////////////////": "",
     "test": "npm run unit:test && npm run test:import-nprr",
-    "test:import-nprr": "npm pack && cd test-projects/import-nprr && npm i $(find ../../ -name 'nprr-*') && npm run script && cd ../..",
+    "test:import-nprr": "npm pack && cd test-projects/import-nprr && npm i $(find ../../ -name 'nprr-*.tgz') && npm run script && cd ../..",
     "test:trap": "jest -t 'Trap succeed'",
     "stryker": "npx stryker run"
   },

src/index.js

@@ -9,13 +9,14 @@ const main = argv => {
   const { scriptName, options } = parseCmd(argv);
   return readNpmScripts()
     .then(scripts => autocomplete({ choices: scripts, filter: scriptName }))
-    .then(answer => {
-      return new Promise(resolve => {
-        const params = [answer, ...options];
-        npm.run(params);
-        resolve(params);
-      });
-    });
+    .then(
+      answer =>
+        new Promise(resolve => {
+          const params = [answer, ...options];
+          npm.run(params);
+          resolve(params);
+        })
+    );
 };
 
 module.exports = main;