Add visionOS platform support (#31)

### Motivation

While this isn't technically necessary, as all versions of a platform
not explicitly mentioned are assumed to be supported, it's better to be
explicit here.

### Modifications

Add `visionOS(.v1)` to the list of supported platforms.

### Result

Clearer support matrix.

### Test Plan

N/A, this is basically just a documentation change.

Author: czechboy0

Package.swift

@@ -25,7 +25,7 @@ let swiftSettings: [SwiftSetting] = [
 let package = Package(
     name: "swift-openapi-async-http-client",
     platforms: [
-        .macOS(.v10_15), .iOS(.v13), .tvOS(.v13), .watchOS(.v6),
+        .macOS(.v10_15), .iOS(.v13), .tvOS(.v13), .watchOS(.v6), .visionOS(.v1)
     ],
     products: [
         .library(

README.md

@@ -9,9 +9,9 @@ A client transport that uses the [HTTPClient](https://swiftpackageindex.com/swif
 Use the transport with client code generated by [Swift OpenAPI Generator](https://github.com/apple/swift-openapi-generator).
 
 ## Supported platforms and minimum versions
-| macOS | Linux | iOS | tvOS | watchOS |
-| :-: | :-: | :-: | :-: | :-: |
-| ✅ 10.15+ | ✅ | ✅ 13+ | ✅ 13+ | ✅ 6+ |
+| macOS     | Linux | iOS    | tvOS   | watchOS | visionOS |
+| :-:       | :-:   | :-:    | :-:    | :-:     | :-:      |
+| ✅ 10.15+ | ✅    | ✅ 13+ | ✅ 13+ | ✅ 6+   | ✅ 1+    |
 
 ## Usage
 

Sources/OpenAPIAsyncHTTPClient/Documentation.docc/Documentation.md

@@ -9,9 +9,9 @@ A client transport that uses the [HTTPClient](https://swiftpackageindex.com/swif
 Use the transport with client code generated by [Swift OpenAPI Generator](https://github.com/apple/swift-openapi-generator).
 
 ### Supported platforms and minimum versions
-| macOS | Linux | iOS | tvOS | watchOS |
-| :-: | :-: | :-: | :-: | :-: |
-| ✅ 10.15+ | ✅ | ✅ 13+ | ✅ 13+ | ✅ 6+ |
+| macOS     | Linux | iOS    | tvOS   | watchOS | visionOS |
+| :-:       | :-:   | :-:    | :-:    | :-:     | :-:      |
+| ✅ 10.15+ | ✅    | ✅ 13+ | ✅ 13+ | ✅ 6+   | ✅ 1+    |
 
 ### Usage