Changed onLinkPress to be optional

Author: agazso

src/index.d.ts

@@ -24,7 +24,7 @@ export type RenderLinkFunction = (
   children: ReactNode[],
   parentNodes: ASTNode[],
   styles: any,
-  onLinkPress: (url: string) => boolean,
+  onLinkPress?: (url: string) => boolean,
 ) => ReactNode;
 
 export type RenderImageFunction = (
@@ -90,7 +90,7 @@ export interface MarkdownProps {
   markdownit?: MarkdownIt;
   mergeStyle?: boolean;
   debugPrintTree?: boolean;
-  onLinkPress: (url: string) => boolean;
+  onLinkPress?: (url: string) => boolean;
 }
 
 type MarkdownStatic = React.ComponentType<MarkdownProps>;