Add screenshot

README.md

@@ -44,6 +44,8 @@ groups (arrays) of commands to execute.
 Each group of commands is executed in order, and the commands within each group are by default
 executed in serial (synchronously) but can optionally be executed in parallel (asynchronously).
 
+![screenshot](screenshot.png)
+
 ## A) Setup
 Install package for node:
 ```shell

package.json

@@ -102,7 +102,7 @@
       "step:12": "copy-file build/umd/run-scripts.js build/run-scripts.umd.cjs",
       "step:20": "add-dist-header build dist",
       "pretest": "npm-run-all step:*",
-      "test": "mocha spec/*.spec.js --timeout 5000",
+      "test": "mocha spec/*.spec.js --timeout 7000",
       "sleep": "node --eval 'setTimeout(() => {}, 500)'",
       "dev": "tsc && add-dist-header build dist && mocha spec/*.spec.js --grep serial"
    },

spec/mocha.spec.js

@@ -76,7 +76,7 @@ describe('Executing the CLI', () => {
 
    it('correctly runs parallel commands', () => {
       // Handy script:
-      //    "devp": "tsc && add-dist-header build dist && rimraf spec/fixtures/target/b && mocha spec/*.spec.js --grep parallel --timeout 5000",
+      //    "devp": "tsc && add-dist-header build dist && rimraf spec/fixtures/target/b && mocha spec/*.spec.js --grep parallel --timeout 7000",
       const cmd = 'node bin/cli.js spec-b1 spec-b2 --parallel --verbose';
       execSync(cmd, { stdio: 'inherit' });
       const actual = revWebAssets.readFolderRecursive('spec/fixtures/target/b');