fix(TS): make container optional in RenderOptions (#253)

**What**: TS: make container optional in RenderOptions

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**Why**: Particularly useful if you're making a custom render with custom options. If you extend the type and call your custom render without the container but with the other options then you get a false error.

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typings/index.d.ts

@@ -14,7 +14,7 @@ export interface RenderResult extends GetsAndQueries {
 }
 
 export interface RenderOptions {
-  container: HTMLElement
+  container?: HTMLElement
   baseElement?: HTMLElement
   hydrate?: boolean
 }