Add support for lists starting with - and *

Author: rlazo

plugins/src/main/java/com/google/firebase/gradle/plugins/Changelog.kt

@@ -264,7 +264,7 @@ data class ReleaseContent(val subtext: String, val changes: List<Change>) {
      * ]
      * ```
      */
-    val CHANGE_REGEX = Regex("^\\* ([\\s\\S]+?)(?=^\\*|(?![\\s\\S]))", RegexOption.MULTILINE)
+    val CHANGE_REGEX = "^[*-] ([\\s\\S]+?)(?=^[*-]|(?![\\s\\S]))".toRegex(RegexOption.MULTILINE)
 
     /**
      * Regex for finding the subtext in a release.