message: clean up issue template
diff: -**Do you want to request a *feature* or report a *bug*?**
  +Do you want to request a *feature* or report a *bug*?
  +-----------------------------------------------------
  -**What is the current behavior?**
  +What is the current behavior?
  +-----------------------------
  +If the current behavior is a bug, please provide the steps to reproduce.
  -**If the current behavior is a bug, please provide the steps to reproduce.**
  -
  -**What is the expected behavior?**
  -
  -**Please mention your oclif and OS version.**
  +What is the expected behavior?
  +------------------------------
  +Please mention your oclif and OS version.
  