Add possibility of sending message with tag

[baudev]

Add the function sendMessageWithTag(recipient, payload, tag, cb) which allows sending messages with the specified tag.

Example of usage :

bot.sendMessageWithTag(payload.sender.id, { "text": "message_test"}, "NON_PROMOTIONAL_SUBSCRIPTION", (error, body) => {
    // ...
});

[eXeDK]

Please fix tests @baudev

[baudev]

Test passed on Node v6 ! https://travis-ci.org/remixz/messenger-bot/jobs/385714367

[eXeDK]

What about Node4? I have not setup these pipelines so I'm not sure I can make changes to those.
Maybe @remixz can.

[baudev]

The mentioned errors in Node4 don't seem to be related to my MR.

EDIT : Sorry for closing the MR. Mistake on my part.

[baudev]

The function could be used as following finally :

bot.sendMessage(payload.sender.id, {"text": "message_test"},  (error, body) => {
    // ...
}, 'MESSAGE_TAG', 'NON_PROMOTIONAL_SUBSCRIPTION');

[baudev]

This issue's comment istanbuljs/nyc#865 (comment) explains that node 4.x is no more supported with the latest versions of nyc. This is confirmed by the following commit: istanbuljs/nyc@19b7d21

We have two options:

• Drops support for node 4.x and then this test in Travis
• Specify the version of nyc. As nyc is a dependency of tap we should specify the version of the latter.

I prefer the last solution: easier and more secure. Then it requires that @remixz remove the node 4 test in his Travis account.

What do you think about @eXeDK ?

[baudev]

I tried everything. I think that specifying the tap version doesn't work due to the Travis cache. Anyway.
@remixz should remove the Node4 test or maybe @eXeDK have the rights of editing/remove/add tests ?

[eXeDK]

I think I have some access to the travis-ci setup as well. I'll try and remove the Node4

[eXeDK]

I'll merge this and try and fix the tests afterwards @baudev