新增代码文件支持行号显示

pub/code_field-master/CHANGELOG.md

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+## [1.0.0-1] - 2021-03-06
+
+* Initial release
+
+## [1.0.0-4] - 2021-03-11
+
+* Added horizontal scrolling support
+* Added code modifiers
+* Cleaner padding API
+
+## [1.0.0-6] - 2021-03-12
+
+* Added a temporary fix for https://github.com/flutter/flutter/issues/77929
+
+## [1.0.0-7] - 2021-03-12
+
+* Added a rawText getter to CodeController
+
+## [1.0.0-9] - 2021-04-21
+
+* Removed dependency on flutter_keyboard_visibility
+
+## [1.0.1-0] - 2021-05-22
+
+* TextEditingController.buildTextSpan breaking change migration for flutter 2.2.0
+
+## [1.0.1-1] - 2021-06-04
+
+* Added wrap paramerter to disable horizontal scrolling
+  
+## [1.0.1-2] - 2021-07-23
+
+* Fixed highlight parsing on web (issue #11)
+
+## [1.0.2] - 2021-07-23
+
+* removeChar & removeSelection methods added
+* added onChange callback
+* added enabled flag
+* fixed middle dot issue
+
+## [1.0.3] - 2022-05-02
+
+* added onTap to CodeField API
+* fixed tab behavior in read-only mode
+* added setCursor method to CodeController