Merge branch 'master' of https://github.com/flutterchina/dio into 100cm-master

Author: wendux

.github/stale.yml

@@ -0,0 +1,28 @@
+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 30
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 7
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - important
+# Label to use when marking an issue as stale
+staleLabel: stale
+# Comment to post when marking an issue as stale. Set to `false` to disable
+markComment: >
+  This issue has been automatically marked as stale because it has not had
+  recent activity. It will be closed if no further activity occurs.
+  If this is still an issue, please make sure it is up to date and if so,
+  add a comment that this is still an issue to keep it open.
+  Thank you for your contributions.
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: false
+
+# Optionally, specify configuration settings that are specific to just 'issues' or 'pulls':
+pulls:
+  daysUntilStale: 60
+  markComment: >
+    This pull request has been automatically marked as stale because it has not had
+     recent activity. It will be closed if no further activity occurs.
+     If this is still applicable, please make sure it is up to date and if so,
+     add a comment that this is still an issue to keep it open.
+     Thank you for your contributions.

package_src/lib/src/dio_error.dart

@@ -23,7 +23,7 @@ enum DioErrorType {
 }
 
 /// DioError describes the error info  when request failed.
-class DioError extends Error {
+class DioError implements Exception {
   DioError({
     this.request,
     this.response,