Update ChangeLog

Author: github-actions[bot]

CHANGELOG.md

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+# Changelog
+
+## v2.0.0 (22/07/2021)
+
+---
+
+## untagged-e0d0140e95f0eb47c981 (01/01/1970)
+## Changes
+- Fix a bug related to run report @soimkim (#6)
+- Add files for executable file @soimkim (#5)
+- Add reuse compliance checking @soimkim (#2)
+
+## 🚀 Features
+
+- Add fosslight_oss_pkg @soimkim (#3)
+
+## 🔧 Maintenance
+
+- Update README @soimkim (#10)
+- Update license text to GPL-3.0-only @soimkim (#8)
+- Update documents @soimkim (#7)
+- Add fosslight_oss_pkg @soimkim (#3)
+- Add files for github actions @soimkim (#4)
+- Modify tox.ini to separate release test from normal test @bjk7119 (#1)