Update backend docs with newest update

content/4.backend/3.changelog.md

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 title: 'Changelog'
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+# Version 1.2.0
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+Bugfixes and optimization.
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+For this update, you will need to run migrations.
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+- Added option to trust cloudflare IP headers for ratelimits
+- Removed unused table
+- Optimized prometheus metrics, should make less indexes
+
+
 # Version 1.1.5
 
 Initial version of the backend.