Update CHANGELOG.md for v2.1.0. closes #162

Author: kurtlawrence

CHANGELOG.md

@@ -1,5 +1,4 @@
 # Unreleased
-- Document crate MSRV of `1.70`.
 
 - Updated top-level docs to include a note about `ColoredString`\'s role in the `Colorize` pipeline as well as link to it to suggest learning more about how to manipulate existing `ColoredString`\'s.
 - Changes to `ColoredString`:
@@ -22,6 +21,13 @@
 - Added additional testing for all of the above changes.
 - Added methods `with_style` and `with_color_and_style` to `Colorize`.
 
+# 2.1.0
+* Impl From<String> for ColoredString by @mahor1221 in https://github.com/colored-rs/colored/pull/126
+* Allow conversion from ColoredString to Error by @spenserblack in https://github.com/colored-rs/colored/pull/86
+* Suggestion for minor documentation clarification by @jonasbn in https://github.com/colored-rs/colored/pull/98
+* Remove unnecessary is_terminal dependency by @Oakchris1955 in https://github.com/colored-rs/colored/pull/149
+  - Document crate MSRV of `1.70`.
+
 # 2.0.4
 - Switch from `winapi` to `windows-sys`.