release description.

Author: cgspine

qmuidemo/src/main/java/com/qmuiteam/qmuidemo/manager/UpgradeTipTask.java

@@ -72,7 +72,7 @@ public CharSequence getUpgradeWord(final Activity activity) {
         SpannableStringBuilder text = new SpannableStringBuilder();
         if(mNewVersion == QDUpgradeManager.VERSION_2_0_0_alpha6){
             text.append("1. Features: Add new widget QMUITabSegment2 to support ViewPager2.\n");
-            text.append("2. Remove the default support for skin.\n");
+            text.append("2. Remove the skin's default usage.\n");
             text.append("3. QMUILayout support radius which is half of the view height or width.\n");
             text.append("4. Some bug fixes.");
         }else if(mNewVersion == QDUpgradeManager.VERSION_2_0_0_alpha4){