v0.1.0

- Added `postgrid`, a REST client generated with oapi-codegen from PostGrid's OpenAPI document (PostGrid Address Verification API, spec version 1.0, OpenAPI 3.0.0). It includes every print and mail and address verification operation in the document.
- Unformatted number fields are `float64` instead of oapi-codegen's default `float32`.
- The spec patch also names the shared search parameter's inline string branch, avoiding undefined `N0` references while retaining text and structured search.
- `make generate` reads `openapi_spec_url` from `https://raw.githubusercontent.com/postgrid/postgrid-node/main/.stats.yml`, downloads the Stainless-hosted spec, collapses duplicate identical response unions and regenerates the client. The initial source is `https://storage.googleapis.com/stainless-sdk-openapi-specs/postgrid/postgrid-a1e82d54f9c6456622ef353b6864dd9ccc47c9b5cf6b5fbe98c123f2bdf30f34.yml`. The spec is not committed.