fix XO lint issues

test/error.js

@@ -22,8 +22,8 @@ test('properties', async t => {
 	} catch (err) {
 		t.truthy(err);
 		t.truthy(err.response);
-		t.truthy(!err.propertyIsEnumerable('response'));
+		t.false(err.propertyIsEnumerable('response'));
-		t.truthy(!err.hasOwnProperty('code'));
+		t.false(err.hasOwnProperty('code'));
 		t.is(err.message, 'Response code 404 (Not Found)');
 		t.is(err.host, `${s.host}:${s.port}`);
 		t.is(err.method, 'GET');

test/json.js

@@ -48,7 +48,7 @@ test('wraps parsing errors', async t => {
 		t.fail('Exception was not thrown');
 	} catch (err) {
 		t.regex(err.message, /Unexpected token/);
-		t.truthy(err.message.indexOf(err.hostname) !== -1, err.message);
+		t.true(err.message.indexOf(err.hostname) !== -1, err.message);
 		t.is(err.path, '/invalid');
 	}
 });