Migrate to servant v0.7

[klappvisor]

Migrate to servant v0.7

[Arguggi]

I can try and help. Since the stackage nightly-2016-05-08 has servant v0.6.1 I'll migrate to that version. Then migrating to v0.7 is easy since releases should be much smaller now.

From the servant changelogs I think this is what is needed:

• Switch from EitherT to ExceptT
• Add Manager and BaseUrl to every api function (see servant-client v0.6 changelog)
• Switch from ToText and FromText to ToHttpApiData and FromHttpApiData

So the following dependecies should be needed:

• transformers (ExceptT)
• http-api-data ({To,From}HttpApiData)
• http-client (Manager)

I'll send a pull request soon if everything goes as planned.

[klappvisor]

Hi Arguggi,
Contribution is highly appreciated!

[Arguggi]

I was almost done but the most recent tls (1.3*) library seems to be bugged. I tried sending a message to telegram but received a connection error (looks like this issue) . Compiling with tls-1.2.2 seems to works.

Edit: tls-1.3.7 seems to fix the error

[klappvisor]

Updated servant version to v0.7 via extra-deps. I will come back to it to check resolver version before merge to master.