Add support for new scopes

[danstn]

Addresses #22

:package:

• Extended Scope constructor to include public_content and follower_list scopes
• Defined a Show instance
• Removed toLower from buildScopes composition (delegated to show) in getUserAccessTokenURL1

Stack repl:

>> let l = [Basic, Relationships, FollowerList, PublicContent, Comments, Likes]
>> [("scope",BS.intercalate "+" $ map (TE.encodeUtf8 . pack . show) l)]
[("scope","basic+relationships+follower_list+public_content+comments+likes")]

According to the API Docs | Authorization:

• basic - to read a user’s profile info and media (granted by default)
• public_content - to read any public profile info and media on a user’s behalf
• follower_list - to read the list of followers and followed-by users
• comments - to post and delete comments on a user’s behalf
• relationships - to follow and unfollow accounts on a user’s behalf
• likes - to like and unlike media on a user’s behalf

[danstn]

Any feedback on this one, @meteficha?

[cdepillabout]

This looks good to me.

[cdepillabout]

@meteficha I merged this pull request, bumped to version 0.7, and made a release on Hackage.

https://hackage.haskell.org/package/ig-0.7

If there are any problems with this, we can fix it and make a new release.

[danstn]

:+1: