fix: typo in unauthenticated error message (#28)

Author: gr2m

src/hook.ts

@@ -26,7 +26,7 @@ export async function hook(
 
   if (MUTATING_METHODS.includes(endpoint.method)) {
     throw new RequestError(
-      `"${endpoint.method} ${endpoint.url}" is not permitted due to lack authentication. Reason: ${reason}`,
+      `"${endpoint.method} ${endpoint.url}" is not permitted due to lack of authentication. Reason: ${reason}`,
       403,
       {
         request: request.endpoint.parse(endpoint),

test/index.test.ts

@@ -192,7 +192,7 @@ test('auth.hook(request, "PATCH /repos/octocat/hello-world") fails without sendi
     throw new Error("should not resolve");
   } catch (error) {
     expect(error.message).toBe(
-      '"PATCH /repos/octocat/hello-world" is not permitted due to lack authentication. Reason: test'
+      '"PATCH /repos/octocat/hello-world" is not permitted due to lack of authentication. Reason: test'
     );
   }
 });