fix mispell

build/lib/task.ts

@@ -54,7 +54,7 @@ async function _doExecute(task: Task): Promise<void> {
 	// Always invoke as if it were a callback task
 	return new Promise((resolve, reject) => {
 		if (task.length === 1) {
-			// this is a calback task
+			// this is a callback task
 			task((err) => {
 				if (err) {
 					return reject(err);
@@ -122,4 +122,4 @@ export function define(name: string, task: Task): Task {
 	task.taskName = name;
 	task.displayName = name;
 	return task;
-}
+}