Docs fixes (#13)

Docs fixes

### Motivation

Docs should be correct.

### Modifications

Update docs with the latest versions.

### Result

N/A

### Test Plan

N/A


Reviewed by: dnadoba

Builds:
     ✔︎ pull request validation (5.8) - Build finished. 
     ✔︎ pull request validation (5.9) - Build finished. 
     ✔︎ pull request validation (nightly) - Build finished. 
     ✔︎ pull request validation (soundness) - Build finished. 

#13

Author: czechboy0

README.md

@@ -16,7 +16,7 @@ Add the package dependency in your `Package.swift`:
 ```swift
 .package(
     url: "https://github.com/apple/swift-openapi-urlsession",
-    .upToNextMinor(from: "0.1.0")
+    .upToNextMinor(from: "0.2.0")
 ),
 ```
 

Sources/OpenAPIURLSession/Documentation.docc/Documentation.md

@@ -20,7 +20,7 @@ Add the package dependency in your `Package.swift`:
 ```swift
 .package(
     url: "https://github.com/apple/swift-openapi-urlsession",
-    .upToNextMinor(from: "0.1.0")
+    .upToNextMinor(from: "0.2.0")
 ),
 ```