[FIX] Allow array filters in get requests

[plduhoux]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Bug fix : allow array filtering while requesting entries

Arrays are sent to strapi with multiple parameters with the same name (not suffixed with [xxx])

Actually, you can't send to strapi the following request using the sdk : http://localhost:1337/themes?tags_in=2&tags_in=1

With this PR, you can :

  strapi.getEntries("themes", { tags_in: [2,1] })

• What is the current behavior? (You can also link to an open issue here) https://github.com/strapi/strapi-sdk-javascript/issues/67

• What is the new behavior (if this is a feature change)?

Multiple params with the same name are sent to strapi, allowing filters like in

[strapi-cla]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

Pierre-Louis Duhoux seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}