add changelog for version v0.15.0

fastlane/metadata/android/en-US/changelogs/70.txt

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+ATTENTION: This version probably is a bugfest, just like the last one. However due to the full shutdown since the 17. a broken version is better then no version. Right? ¯\_(ツ)_/¯
+
+### Improvements
+* downloaded files can now be opened with one click #1879 
+* drop support for android 4.1 - 4.3 #1884 
+* remove old player #1884 
+* remove streams from current play queue by swiping them to the right #1915 
+* remove auto queued stream when a new stream is enqueued manually #1878 
+* Postprocessing for downloads and implement missing features #1759 by @kapodamy
+  * Post-processing infrastructure
+  * Proper error handling "infrastructure" (for downloader)
+  * Queue instead of multiple downloads
+  * Move serialized pending downloads (`.giga` files) to app data
+  * Implement max download retry
+  * Proper multi-thread download pausing
+  * Stop downloads when swicthing to mobile network (never works, see 2nd point)
+  * Save the thread count for next downloads
+  * A lot of incoherences fixed
+
+### Fixed
+* Fix crash with default resolution set to best and limited mobile data resolution #1835
+* pop-up player crash fixed #1874 
+* NPE when trying to open background player #1901
+* Fix for inserting new streams when auto queuing is enabled #1878
+* Fixed the decypering shuttown issue