fix(create-twilio-function): adds rootDir to generated tsconfig.json (#362)

Author: philnash

packages/create-twilio-function/src/create-twilio-function/create-files.js

@@ -130,6 +130,7 @@ function createTsconfigFile(pathName) {
           module: 'commonjs',
           strict: true,
           esModuleInterop: true,
+          rootDir: 'src',
           outDir: 'dist',
           skipLibCheck: true,
           sourceMap: true,