no-expression-statements: shouldn't flag yield statements

[danielnixon]

Bug Report

For the purposes of the no-expression-statements rule, I think a yield statement should be treated like a return statement, i.e., not flagged as a lint issue.

export function* mySaga() {
  // Flagged by functional/no-expression-statements
  yield "hello";

  // Not flagged
  return "hello";
}

Expected behavior

yield xyz not flagged

Actual behavior

yield xyz flagged

Steps to reproduce

See example above.

Proposed changes

Add a dedicated special case to checkExpressionStatement for yield statements.