Bump version from 2.1.0 to 2.1.1

[ecooper]

Patch release for #275.

In the current version (2.1.0), ConstraintFailure had incorrect types for paths:

// v2.1.0 Type declaration in wire-protocol.ts...
export type ConstraintFailure = {
  /** Description of the constraint failure */
  message: string;
  /** Name of the failed constraint */
  name?: string;
  /** Path into the write input data to which the failure applies */
  paths?: Array<number | string>;
};

In #275, paths was updated to match what Fauna returns at runtime :

// v2.1.1 Type declaration in wire-protocol.ts...
export type ConstraintFailure = {
  /** Description of the constraint failure */
  message: string;
  /** Name of the failed constraint */
  name?: string;
  /** Path into the write input data to which the failure applies */
  paths?: Array<Array<number | string>>;
};

Because of the nature of #275, you could argue this change is backwards incompatible because the types for the ConstraintFailureError are changing in an incompatible way. However, if any code actually uses paths at runtime and expected a single array vs a nested one, it would fail at runtime. Code not specifically relying on the structure of paths is not impacted. With all that in mind, the team agreed that a patch is most suitable instead of a more dogmatic major version release, but this PR can be used to debate that if need be.

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