Delete element from array by location

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examples/arrays/delete_at.cr

planets = ["Mercury", "Venus", "Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune"]
puts planets.delete_at(1)
puts planets

puts planets.delete_at(1, 3)
puts planets

Venus
["Mercury", "Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune"]
["Earth", "Mars", "Jupiter"]
["Mercury", "Saturn", "Uranus", "Neptune"]