Update extractor version

Update changelog

app/build.gradle

@@ -11,8 +11,8 @@ android {
         applicationId "org.schabi.newpipe"
         minSdkVersion 19
         targetSdkVersion 28
-        versionCode 860
-        versionName "0.18.6"
+        versionCode 870
+        versionName "0.18.7"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
@@ -63,7 +63,7 @@ dependencies {
         exclude module: 'support-annotations'
     })
 
-    implementation 'com.github.TeamNewPipe:NewPipeExtractor:6446abc6d'
+    implementation 'com.github.TeamNewPipe:NewPipeExtractor:6f03c6e87'
     testImplementation 'junit:junit:4.12'
     testImplementation 'org.mockito:mockito-core:2.23.0'
 

fastlane/metadata/android/en-US/changelogs/870.txt

@@ -0,0 +1,2 @@
+This is a hotfix release updating NewPipe to allow using SoundCloud without major hassles again.
+SoundCloud's v2 API is used in the extractor now and the detection of invalid client IDs has been improved.