Increment render node version for variantOverrides

Increments the patch value of the render node schema to 0.2.0 to account
for addition of the top-level `variantOverrides` property.

Author: franklinsch

Sources/SwiftDocC/Model/Rendering/RenderNode.swift

@@ -109,7 +109,7 @@ public struct RenderNode: VariantContainer {
     /// > Note: The patch value is currently unused and always set to `0`.
     public var schemaVersion = SemanticVersion(
         major: 0,
-        minor: 1,
+        minor: 2,
         patch: 0
     )
 

Sources/SwiftDocC/SwiftDocC.docc/Resources/RenderNode.spec.json

@@ -2,7 +2,7 @@
     "openapi": "3.0.0",
     "info": {
         "description": "Render Node API",
-        "version": "0.1.0",
+        "version": "0.2.0",
         "title": "Render Node API"
     },
     "paths": { },