fix: Use default import to fix --help flag

Author: rtfpessoa

src/cli.ts

@@ -1,6 +1,6 @@
-import * as fs from 'fs';
-import * as os from 'os';
-import * as path from 'path';
+import fs from 'fs';
+import os from 'os';
+import path from 'path';
 
 import * as clipboardy from 'clipboardy';
 import open = require('open');

src/configuration.ts

@@ -1,4 +1,4 @@
-import * as path from 'path';
+import path from 'path';
 
 import { Configuration } from './types';
 import { Argv } from './yargs';

src/utils.ts

@@ -1,5 +1,5 @@
-import * as childProcess from 'child_process';
-import * as fs from 'fs';
+import childProcess from 'child_process';
+import fs from 'fs';
 
 export function exists(filePath: string): boolean {
   try {

src/yargs.ts

@@ -1,4 +1,4 @@
-import * as yargs from 'yargs';
+import yargs from 'yargs';
 
 import {
   StyleType,
@@ -187,8 +187,10 @@ export function setup(): Argv {
     .example('diff2html -F my-pretty-diff.html -- -M HEAD~1', 'print to file')
     .example('diff2html --ig package-lock.json --ig yarn.lock', 'ignore two particular files when generating the diff')
     .help()
-    .alias('v', 'version')
-    .alias('h', 'help')
+    .alias('help', 'h')
+    .alias('help', '?')
+    .version()
+    .alias('version', 'v')
     .epilog(
       `© 2014-${currentYear} rtfpessoa
       For more information, check out https://diff2html.xyz/