Eval helper doesn't match VTEX's implementation

[jpesce]

The eval helper on this repo doesn't match the eval helper currently in production in VTEX.

Here's the result of {{eval "'${string}'.split(' ')[0]" string=_accountInfo.CompanyName}} in VTEX:

Here's the result in vtex-emails:

PR https://github.com/vtex/vtex-emails/pull/25 fixes this.