changelog updates

backend/CHANGELOG.md

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 # Changelog
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 <!--
    PRs should document their user-visible changes (if any) in the
    Unreleased section, uncommenting the header as necessary.
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 <!-- ## Unreleased -->
 <!-- ### Changed -->
 <!-- ### Added -->
 <!-- ### Removed -->
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 ## Unreleased [2.0.0 - 2019-04-XX]
 ### Changed
 * require Elasticsearch 6.x
 * move data structure to single document per index 
+* got rid of bower and moved to npm in build process
+* updated angular packages to new versions
 
 ## [1.2.0 - 2019-03-17]
 ### Changed
 * Replaced elasticsearch client
 * Bumped a most deps to latest version
 * Preparing to move from elasticsearch 2.x to modern versions