cordova-sqlite-ext doc updates

NOTE: cordova-sqlite-ext 0.10.6 has incorrect -DSQLITE_THREADSAFE=1
build flag on iOS due to a mistake in the merge. This will be changed
to SQLITE_THREADSAFE=2 for iOS in the next release.

ADDITIONAL NOTE: plugin.xml has duplicate macOS ("osx") platform
section, also due to a mistake in the merge. The duplicate macOS
platform section will be removed from the next release.

ref: storesafe/cordova-sqlite-storage#703

CHANGES.md

@@ -2,10 +2,11 @@
 
 ## cordova-sqlite-ext 0.10.6
 
+- SQLite 3.15.2 build with SQLITE_THREADSAFE=2 on macOS ONLY (SQLITE_THREADSAFE=1 on Android/iOS/Windows) and other flag fixes in this plugin version
+
 ##### cordova-sqlite-legacy-core 1.0.2
 
 - Fix log in case of transaction waiting for open to finish; doc fixes
-- SQLite 3.15.2 build with SQLITE_THREADSAFE=2 on iOS/macOS (SQLITE_THREADSAFE=1 on Android/Windows) and other flag fixes in this version branch to avoid possible malformed database due to multithreaded access ref: litehelpers/Cordova-sqlite-storage#703
 - Windows 10 (UWP) build with /SAFESEH flag on Win32 (x86) target
 
 ###### cordova-sqlite-legacy-express-core 1.0.2