This releases focuses on supporting Scala 2.13 and adding more features. Changes since 0.1.0:

• Add support for Scala 2.13.
• Add Labeled trait for easy labeling of quantum primitives.
• Add labels that can be added to qubits by the user and that are automatically applied to classical bits after measurement.
• Add multiple qubit support to Target gates.
• Add Swapped trait and SWAP default gate.
• Rewrite QuantumSimulator.controlMatrix to support multi-qubit target gates. The matrix construction loop was rewritten to be more efficient.
• Move all error and validation messages to ErrorMessage.
• Add a sum type (One and Zero of type Bit) to represent classical bits in place of integers.
• Add index uniqueness validation for multi-qubit gates.

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