Update README and ReleaseNotes for 4.8.4v4.8.4

Trim back CHANGELOG
Add entry for recent fix for multiple dive master in mobile.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 1 insertions, 21 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9af0aa052..c86059999 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,24 +1,4 @@
-- Windows: add experimental support for BTLE dive computers.
-  For more information have a look at section 5.2.2 of the user
-  manual ("On Windows").
-- Import: Fix import of CSV files containing quotes
-- Desktop: Show coordinates if no tags from reverse geo lookup
-- Desktop: Sort on date in case of equal fields
-- Desktop: Indicate sort direction in list header
-- Desktop: Use defined sort-order when switching sort column
-- Fix a bug in planner for dives with manual gas changes.
-- Mobile: add full text filtering of the dive list
-- Desktop: don't add dive-buddy or dive-master when tabbing through fields
-- Filter: don't recalculate all filters on dive list-modifying operations
-- Desktop: don't recalculate full dive list on dive list-modifying operations
-- Undo: implement undo/redo for all dive list-modifying operations
-- Mobile: preserve manual/auto sync with cloud [#1725]
-- Desktop: don't show "invalid dive site" debugging message
-- Map: zoom on dive site when selecting items in dive site list
-- Performance: calculate full statistics only when needed
-- HTML export: write statistics of exported dives only
-- Desktop: fix calculation of surface interval in the case of overlappimg dives
-- Desktop: import Poseidon MkIV via dive log import dialog
+- Tag: high level what changed (please replace this line with your first CHANGELOG entry)
 ---
 * Always add new entries at the very top of this file above other existing entries and this note.
 * Use this layout for new entries: `[Area]: [Details about the change] [reference thread / issue]`