Automatically insert space when line breaking in a comment

Added a setting to detect if previous comment starts with
a space, and add a space on line break.

Author: taminomara

src/languageConfiguration.ts

@@ -40,6 +40,10 @@ export class LuaLanguageConfiguration implements LanguageConfiguration {
         // 第二个参数是默认值（当配置不存在时使用）
         if (autoInsertTripleDash) {
             this.onEnterRules = [
+                {
+                    action: { indentAction: IndentAction.None, appendText: "--- " },
+                    beforeText: /^--- /,
+                },
                 {
                     action: { indentAction: IndentAction.None, appendText: "---" },
                     beforeText: /^---/,