added changes to changelog

CHANGELOG.md

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 ### Changed
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 - Change color of lines in plot_anomalies and plot_clusters, add grid to all plots, make trend line thicker in plot_trend ([#705](https://github.com/tinkoff-ai/etna/pull/705))
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+- Change format of holidays for holiday_plot ([#708](https://github.com/tinkoff-ai/etna/pull/708))
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 - Add xticks parameter for plot_periodogram, clip frequencies to be >= 1 ([#706](https://github.com/tinkoff-ai/etna/pull/706))
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 ### Fixed
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