• VSCode Version: Version 1.28.2 (1.28.2)
• OS Version: OSX 10.14

Steps to Reproduce:

1. add "envFile": "${workspaceRoot}/.env" to launch.json
2. add value to .env that contains ! characters

my_secret=SomeAwesomeSecret!!!

Does this issue occur when all extensions are disabled?: Yes

Because ! is previous command in bash when it loads the .env file it fails catastrophically. These characters (and probably others) should be escaped when .env is loaded or perhaps it should be loaded in a way that doesn't try to execute things like that.