Fixes microsoft/monaco-editor#1796: Expose ConfigurationChangedEvent.hasChanged in the API

src/vs/editor/common/config/editorOptions.ts

@@ -624,9 +624,6 @@ export class ConfigurationChangedEvent {
 	constructor(values: boolean[]) {
 		this._values = values;
 	}
-	/**
-	 * @internal
-	 */
 	public hasChanged(id: EditorOption): boolean {
 		return this._values[id];
 	}

src/vs/monaco.d.ts

@@ -3089,6 +3089,7 @@ declare namespace monaco.editor {
 	 * An event describing that the configuration of the editor has changed.
 	 */
 	export class ConfigurationChangedEvent {
+		hasChanged(id: EditorOption): boolean;
 	}
 
 	/**