Add a linter to check that arguments after an argument with default value have a default value as well

[paulponcet]

It seems good practice to avoid arguments without a default value if a preceding argument already has a default value:

# Bad
function(x, y = 1, z) {
  # some code
}

# Good
function(x, y = 1, z = 0) {
  # some code
}

# Good as well
function(x, z, y = 1) {
  # some code
}