[apollo-bot] Update the Issue/PR Templates with auto label

[ghost]

This PR contains an update to the issue templates that adds a notice about being able to add labels to Issues and PRs

[apollo-cla]

@apollo-bot[bot]: Thank you for submitting a pull request! Before we can merge it, you'll need to sign the Meteor Contributor Agreement here: https://contribute.meteor.com/

[codecov-io]

Codecov Report

Merging #87 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #87   +/-   ##
=======================================
  Coverage   90.23%   90.23%           
=======================================
  Files           2        2           
  Lines         256      256           
  Branches       80       80           
=======================================
  Hits          231      231           
  Misses         21       21           
  Partials        4        4

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