Fix package.json location (#456) (#458)

From #456

Parse ohm's package.json file to obtain the version.
cli.js was parsing the package.json in the current directory to obtain
the package version.
It now parses its own package.json file, not the one from the
project that is using ohm.

Co-authored-by: Andy Sturrock <andysturrock@users.noreply.github.com>

Author: andysturrock

packages/cli/src/cli.js

@@ -2,8 +2,9 @@ import {Command} from 'commander';
 
 import fs from 'fs';
 import commands from './commands/index.js';
+import url from 'url';
 
-const {version} = JSON.parse(fs.readFileSync('./package.json'));
+const {version} = JSON.parse(fs.readFileSync(new url.URL('../package.json', import.meta.url)));
 
 export function ohmCli(userArgs, optsForTesting = {}) {
   const program = new Command();