Add CHANGELOG.md.

Author: ryanlovett

CHANGELOG.md

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+## 1.5
+
+### 1.5 - 2021-12-01
+
+#### Enhancements made
+
+- Support recent rstudio-server releases.
+
+#### Dependency updates
+
+* Bump jupyter-server-proxy from 3.1.0 to 3.2.0.
+* Remove check for RSESSION_PROXY_RSTUDIO_1_4 environment variable. jupyter-rsession-proxy now supports later versions of rstudio-server 1.4 and the newer date-based releases. For older versions of rstudio-server, please use jupyter-rsession-proxy <= 1.4.
+
+## Merged PRs
+
+* Rewrite /auth-sign-in redirect. [#110](https://github.com/jupyterhub/jupyter-rsession-proxy/pull/110) ([@ryanlovett](https://github.com/ryanlovett))
+* Bump to v1.4. [#105](https://github.com/jupyterhub/jupyter-rsession-proxy/pull/105) ([@ryanlovett](https://github.com/ryanlovett))
+* Use tmp file for secure cookie [#98](https://github.com/jupyterhub/jupyter-rsession-proxy/pull/98) ([@danielfrg](https://github.com/danielfrg))
+
+## Contributors to this release
+
+([GitHub contributors page for this release](https://github.com/jupyterhub/jupyter-rsession-proxy/graphs/contributors?from=2021-07-03&to=2021-11-30&type=c))
+
+[@danielfrg](https://github.com/search?q=repo%3Ajupyterhub%2Fjupyter-rsession-proxy+involves%3Adanielfrg+updated%3A2021-07-03..2021-11-30&type=Issues) | [@dhirschfeld](https://github.com/search?q=repo%3Ajupyterhub%2Fjupyter-rsession-proxy+involves%3Adhirschfeld+updated%3A2021-07-03..2021-11-30&type=Issues) | [@garyburgmann](https://github.com/search?q=repo%3Ajupyterhub%2Fjupyter-rsession-proxy+involves%3Agaryburgmann+updated%3A2021-07-03..2021-11-30&type=Issues) | [@JamesSample](https://github.com/search?q=repo%3Ajupyterhub%2Fjupyter-rsession-proxy+involves%3AJamesSample+updated%3A2021-07-03..2021-11-30&type=Issues) | [@meeseeksmachine](https://github.com/search?q=repo%3Ajupyterhub%2Fjupyter-rsession-proxy+involves%3Ameeseeksmachine+updated%3A2021-07-03..2021-11-30&type=Issues) | [@orboan](https://github.com/search?q=repo%3Ajupyterhub%2Fjupyter-rsession-proxy+involves%3Aorboan+updated%3A2021-07-03..2021-11-30&type=Issues) | [@riazarbi](https://github.com/search?q=repo%3Ajupyterhub%2Fjupyter-rsession-proxy+involves%3Ariazarbi+updated%3A2021-07-03..2021-11-30&type=Issues) | [@ryanlovett](https://github.com/search?q=repo%3Ajupyterhub%2Fjupyter-rsession-proxy+involves%3Aryanlovett+updated%3A2021-07-03..2021-11-30&type=Issues) | [@vnijs](https://github.com/search?q=repo%3Ajupyterhub%2Fjupyter-rsession-proxy+involves%3Avnijs+updated%3A2021-07-03..2021-11-30&type=Issues) | [@welcome](https://github.com/search?q=repo%3Ajupyterhub%2Fjupyter-rsession-proxy+involves%3Awelcome+updated%3A2021-07-03..2021-11-30&type=Issues) | [@yuvipanda](https://github.com/search?q=repo%3Ajupyterhub%2Fjupyter-rsession-proxy+involves%3Ayuvipanda+updated%3A2021-07-03..2021-11-30&type=Issues) | [@zeehio](https://github.com/search?q=repo%3Ajupyterhub%2Fjupyter-rsession-proxy+involves%3Azeehio+updated%3A2021-07-03..2021-11-30&type=Issues)
+
+([full changelog](https://github.com/jupyterhub/jupyter-rsession-proxy/compare/3c6e224...526eeab29e9f8d88fa61a8d60d41e3812b47bd43))
+
+This document was partially generated by [github-activity](https://github.com/executablebooks/github-activity).