Update changelogs

fastlane/metadata/android/en-US/changelogs/669.txt

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+* Support for end-to-end encryption with EteSync
+* Bug fixes
+* Update translations
+
+Full release notes: https://tasks.org/changelog

fastlane/metadata/android/en-US/changelogs/674.txt

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+* Updated app preferences
+
+Full release notes: https://tasks.org/changelog

fastlane/metadata/android/en-US/changelogs/680.txt

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+* Dark mode is now free for all
+* Choose any list or widget color with a color wheel (PRO)
+* 21 new theme colors (PRO)
+* New 'System default' theme
+* Dark theme is now darker
+* Improved dialog theme consistency
+* Bug fixes and translation updates
+
+Full release notes: https://tasks.org/changelog

fastlane/metadata/android/en-US/changelogs/8.0.txt

@@ -1,28 +0,0 @@
-8.0 (2020-02-12)
-
-* Support for end-to-end encryption with EteSync
-* Bug fixes
-* Update translations
-
-7.8 (2020-01-24)
-
-* Android AutoBackup integration
-
-7.7 (2020-01-22)
-
-* Multi-level subtasks without synchronization
-
-7.6.1 (2020-01-17)
-
-* Change tags with multi-select
-
-7.5 (2020-01-07)
-
-* New tag picker
-* Support self-signed SSL certificates for CalDAV synchronization
-
-7.4 (2019-12)
-
-* Add Google Task and CalDAV subtasks from task edit screen
-
-Full release notes: https://tasks.org/changelog