fix #1906 - implement BITFIELD_RO (#1988)

* fix #1906 - implement BITFIELD_RO

* set bitfield_ro min version to 6.2

packages/client/lib/commands/BITFIELD_RO.spec.ts

@@ -0,0 +1,27 @@
+import { strict as assert } from 'assert';
+import testUtils, { GLOBAL } from '../test-utils';
+import { transformArguments } from './BITFIELD_RO';
+
+describe('BITFIELD RO', () => {
+    testUtils.isVersionGreaterThanHook([6, 2]);
+
+    it('transformArguments', () => {
+        assert.deepEqual(
+            transformArguments('key', [{
+                encoding: 'i8',
+                offset: 0
+            }]),
+            ['BITFIELD_RO', 'key', 'GET', 'i8', '0']
+        );
+    });
+
+    testUtils.testWithClient('client.bitFieldRo', async client => {
+        assert.deepEqual(
+            await client.bitFieldRo('key', [{
+                encoding: 'i8',
+                offset: 0
+            }]),
+            [0]
+        );
+    }, GLOBAL.SERVERS.OPEN);
+});