Type stubs for mypy (#1231)

* First attempt at stubs

* fix AuthenticatedUser.piy

* fix PullRequest.piy

* fix Authorization.piy

* fix Branch.piy

* fix Clones.piy

* fix Commit.piy

* fix CommitCombinedStatus.piy

* fix CommitComment.piy

* fix CommitStatus.piy

* fix ContentFile.piy

* fix Download.piy

* fix Event.piy

* fix File.piy

* fix Gist.piy

* fix GistComment.piy

* fix GistFile.piy

* fix GitAuthor.piy

* fix GitBlob.piy

* fix GitCommit.piy

* fix GitRef.piy

* fix GitRelease.piy

* renamed stubs into pyi files

* fix Notification

* fix Repository

* fix GitReleaseAsset

* fix GitTag

* fix GitTree

* fix GitTreeElement

* fix GithubException

* fix GithubObject

* fix GitignoreTemplate

* fix HookDescription

* fix HookResponse

* fix InputGitAuthor

* fix Installation

* fix InstallationAuthorization

* fix Invitation

* fix Issue

* fix IssueComment

* Fix random issues found while testing

* fix IssuePullRequest

* fix Label

* fix License

* fix Migration

* fix Milestone

* fix NamedUser

* fix NotificationSubject

* fix Organization

* fix PaginatedList

* fix Path

* fix Permissions

* fix Plan

* fix Project

* fix ProjectCard

* fix ProjectColumn

* fix PullRequestComment

* fix PullRequestMergeStatus

* fix PullRequestPart

* fix PullRequestReview

* fix Rate

* fix RateLimit

* fix Reaction

* fix Referrer

* fix RepositoryKey

* fix RequiredPullRequestReviews

* fix RequiredStatusChecks

* fix SourceImport

* fix Stargazer

* fix StatsCodeFrequency

* fix StatsCommitActivity

* fix StatsContributor

* fix Tag

* fix Team

* fix Topic

* fix UserKey

* fix MainClass

* fix Requester

* added stubs for View

* added stubs for Membership

* various syntax errors

* silence mypy noise

* keeping track of recent changes

* black + isort

Co-authored-by: Liuyang Wan <lwan@zendesk.com>

github/ContentFile.py

@@ -55,6 +55,9 @@ class ContentFile(github.GithubObject.CompletableGithubObject):
 
     @property
     def decoded_content(self):
+        """
+        :type: bytes
+        """
         assert self.encoding == "base64", "unsupported encoding: %s" % self.encoding
         return base64.b64decode(bytearray(self.content, "utf-8"))