add ember-no-implicit-this-codemod

manifest.json

@@ -57,5 +57,13 @@
     "projectOptions": ["app", "addon"],
     "nodeVersion": "6.0.0",
     "commands": ["ember-3x-codemods deprecate-merge app/**/*.js"]
+  },
+  "ember-no-implicit-this-codemod": {
+    "versions": {
+      "ember-source": "3.12.0"
+    },
+    "projectOptions": ["app", "addon"],
+    "nodeVersion": "8.0.0",
+    "script": "let ps = execa.command('ember s', { stderr: 'inherit' }); ps.stdout.pipe(process.stdout); try { let url = await new Promise((resolve, reject) => { ps.stdout.on('data', data => { let str = data.toString(); let matches = str.match(/^Build successful \\(\\d+ms\\) – Serving on (.*)$/m); if (matches) { resolve(matches[1]); } }); ps.once('error', reject); ps.once('exit', reject); }); await execa.command(`npx ember-no-implicit-this-codemod ${url} app/`, { stdio: 'inherit' }); } finally { if (!ps.exitCode) { ps.kill(); await new Promise(resolve => { ps.once('exit', resolve); }); } }"
   }
 }