chore: release 3.1.1

Bump the version, date the changelog, and point the install snippet at 3.1.1.

Author: CtrlAltDevelop

CHANGELOG.md

@@ -1,4 +1,4 @@
-## Unreleased
+## 3.1.1 - 2026-10-12
 
 ### Fixed
 

README.md

@@ -387,7 +387,7 @@ indicator and drawing tool is included; there is no paid tier.
 ```yaml
 dependencies:
   material_ui: ">=1.0.0 <2.0.0"
-  ohlcv_chart: ">=3.1.0 <4.0.0"
+  ohlcv_chart: ">=3.1.1 <4.0.0"
 ```
 
 Every widget here is built on the `material_ui` package rather than the

pubspec.yaml

@@ -3,7 +3,7 @@ description: >-
   Candlestick charts for Flutter with 31 indicators, 29 drawing tools and 39
   more chart widgets: depth, order flow, series, pie, treemap, sankey. Pure
   CustomPainter, no WebView.
-version: 3.1.0
+version: 3.1.1
 homepage: https://github.com/CtrlAltDevelop
 repository: https://github.com/CtrlAltDevelop/ohlcv_chart
 issue_tracker: https://github.com/CtrlAltDevelop/ohlcv_chart/issues