Run bot using "npm start" should advise correct URL entry for Emulator

[BruceHaley]

Giving the command: samples\javascript_nodejs\13.core-bot>npm start Runs the bot and offers the following advice:

restify listening to http://[::]:3978 Get Bot Framework Emulator: https://aka.ms/botframework-emulator To talk to your bot, open the emulator select "Open Bot"

Problem: The needed URL to enter into the emulator is not given. Nor does the emulator say what to enter.

Solution: Change the last line to read:

To talk to your bot, open the emulator, select "Open Bot", enter http://localhost:3978/api/messages