run some tests only on supported redis versions, use coveralls parallel mode

lib/commands/ACL_WHOAMI.spec.ts

@@ -1,7 +1,10 @@
 import { strict as assert } from 'assert';
+import { describeHandleMinimumRedisVersion } from '../test-utils';
 import { transformArguments } from './ACL_WHOAMI';
 
 describe('ACL WHOAMI', () => {
+    describeHandleMinimumRedisVersion([6]);
+
     it('transformArguments', () => {
         assert.deepEqual(
             transformArguments(),