Fix retrying uploads by using Octokit retry plugin.

node_modules/bottleneck/src/Sync.coffee

@@ -0,0 +1,28 @@
+DLList = require "./DLList"
+class Sync
+  constructor: (@name, @Promise) ->
+    @_running = 0
+    @_queue = new DLList()
+  isEmpty: -> @_queue.length == 0
+  _tryToRun: ->
+    if (@_running < 1) and @_queue.length > 0
+      @_running++
+      { task, args, resolve, reject } = @_queue.shift()
+      cb = try
+        returned = await task args...
+        () -> resolve returned
+      catch error
+        () -> reject error
+      @_running--
+      @_tryToRun()
+      cb()
+  schedule: (task, args...) =>
+    resolve = reject = null
+    promise = new @Promise (_resolve, _reject) ->
+      resolve = _resolve
+      reject = _reject
+    @_queue.push { task, args, resolve, reject }
+    @_tryToRun()
+    promise
+
+module.exports = Sync