add dokka to path & remove getFollowedUsers

Signed-off-by: Adam Ratzman <adam@adamratzman.com>

Author: adamint

build.gradle

@@ -1,9 +1,12 @@
 buildscript {
     ext.kotlin_version = '1.3.11'
+    ext.dokka_version = '0.9.17'
+
     repositories { jcenter() }
 
     dependencies {
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+        classpath "org.jetbrains.dokka:dokka-gradle-plugin:$dokka_version"
     }
 }
 
@@ -16,6 +19,7 @@ plugins {
 }
 
 apply plugin: 'kotlin'
+apply plugin: 'org.jeaddtbrains.dokka'
 
 group 'com.adamratzman'
 version '2.1.0'
@@ -52,14 +56,28 @@ dependencies {
 
 }
 
+dokka {
+    outputFormat = 'gfm'
+    outputDirectory = 'docs/md'
+
+    jdkVersion = 8
+    includeNonPublic = false
+    impliedPlatforms = ["JVM"]
+
+    linkMapping {
+        dir = "src/main/kotlin"
+        url = "https://github.com/adamint/spotify-web-api-kotlin/tree/master/src/main/kotlin"
+        suffix = "#L"
+    }
+}
+
 spotless {
     kotlin {
         ktlint()
         licenseHeader '/* Created by Adam Ratzman (2018) */'    // License header
     }
 }
 
-
 test {
     systemProperties project.properties.subMap(
             ["clientId", "clientSecret", "spotifyTokenString", "spotifyRedirectUri"]

src/main/kotlin/com/adamratzman/spotify/endpoints/client/ClientFollowingAPI.kt

@@ -11,7 +11,6 @@ import com.adamratzman.spotify.utils.ArtistURI
 import com.adamratzman.spotify.utils.CursorBasedPagingObject
 import com.adamratzman.spotify.utils.EndpointBuilder
 import com.adamratzman.spotify.utils.PlaylistURI
-import com.adamratzman.spotify.utils.SpotifyPublicUser
 import com.adamratzman.spotify.utils.UserURI
 import com.adamratzman.spotify.utils.encode
 import com.adamratzman.spotify.utils.toArray
@@ -120,9 +119,6 @@ class ClientFollowingAPI(api: SpotifyAPI) : FollowingAPI(api) {
         })
     }
 
-    fun getFollowedUsers(): SpotifyRestAction<List<SpotifyPublicUser>> =
-        throw NotImplementedError("Though Spotify will implement this in the future, it is not currently supported.")
-
     /**
      * Add the current user as a follower of another user
      *