Etlas send metrics querry breaks first build

[dmitry-ryadnenko-izettle]

Executing the build for the first time throws this error.

Execution failed for task ':setupEnvironmentEta'.
> Welcome to Etlas, the awesome build tool for the Eta programming language!
  
  We are working hard to make the best platform for pure functional programming
  on the Java Virtual Machine.
  
  Etlas will periodically send usage statistics to help us:
  
  * Make decisions on how to evolve the language
  
  * Build a community portal that displays the data we collect in visual form
  
  * Build an Etlas package repository that will accurately display package popularity
  
  * And more!
  
  For more details, please consult our privacy policy:
  
          http://eta-lang.org/docs/html/privacy-policy.html
  
  Would you like to help us make Eta the fastest growing programming language,
  and help pure functional programming become mainstream? (y/n)
  
  Please re-run this command with:
   * `-PetaSendMetrics=true` for yes
   * `-PetaSendMetrics=false` for no.
  
  This only needs to be done once.

It's easy to fix by running .\gradlew -PetaSendMetrics=[true/false] :setupEnvironmentEta but it takes some time to figure out what's going on. Please consider either adding this parameter to the gradle files or adding a note about this issue and how to solve it to the docs.