add changelog

CHANGELOG.md

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+# Changelog
+
+## [1.1](https://github.com/kmwoley/restic-windows-backup/tree/1.1) (2020-02-15)
+
+[Full Changelog](https://github.com/kmwoley/restic-windows-backup/compare/1.0...1.1)
+
+* Users can now set the following variables to control sending emails on success and/or error conditions.
+* Users can now completely disable maintenance activities.
+
+New `config.ps1` variable defaults for these options are:
+```
+$SnapshotMaintenanceEnabled = $true 
+$SendEmailOnSuccess = $false
+$SendEmailOnError = $true
+```
+
+**Closed issues:**
+
+- Ability to disable maintenance [\#3](https://github.com/kmwoley/restic-windows-backup/issues/3)
+- Ability to disable mail sending [\#2](https://github.com/kmwoley/restic-windows-backup/issues/2)
+
+**Merged pull requests:**
+
+- add options to enable/disable email sending  and maintenance [\#4](https://github.com/kmwoley/restic-windows-backup/pull/4) ([kmwoley](https://github.com/kmwoley))
+
+## [1.0](https://github.com/kmwoley/restic-windows-backup/tree/1.0) (2020-02-09)
+
+[Full Changelog](https://github.com/kmwoley/restic-windows-backup/compare/34eae241aa1dcf08ed1d4d4f930e1d1a5bf5788a...1.0)
+
+
+
+\* *This Changelog was automatically generated by [github_changelog_generator](https://github.com/github-changelog-generator/github-changelog-generator)*