📚 Update CHANGELOG.md

Author: ronisbr

CHANGELOG.md

@@ -1,6 +1,12 @@
 PrettyTables.jl Changelog
 =========================
 
+Version 2.2.6
+-------------
+
+- ![Bugfix][badge-bugfix] Fix the algorithm that obtains the cell data type when
+  showing the row number. ([#208][gh-issue-208])
+
 Version 2.2.5
 -------------
 
@@ -726,6 +732,7 @@ Version 0.1.0
 [gh-issue-198]: https://github.com/ronisbr/PrettyTables.jl/issues/198
 [gh-issue-201]: https://github.com/ronisbr/PrettyTables.jl/issues/201
 [gh-issue-207]: https://github.com/ronisbr/PrettyTables.jl/issues/207
+[gh-issue-208]: https://github.com/ronisbr/PrettyTables.jl/issues/208
 
 [gh-pr-5]: https://github.com/ronisbr/PrettyTables.jl/pull/5
 [gh-pr-8]: https://github.com/ronisbr/PrettyTables.jl/pull/8