Update release notes for v0.21.0

Author: spraints

Releasing.md

@@ -5,12 +5,16 @@ Normally, you should do this:
 
 1. Make sure your HEAD is clean and that it is the same as the upstream master!
 
-    git ls-remote https://github.com/git-tfs/git-tfs.git refs/heads/master
-    git rev-parse HEAD
-    git status
+```
+> git ls-remote https://github.com/git-tfs/git-tfs.git refs/heads/master
+> git rev-parse HEAD
+> git status
+```
 
 2. Set the auth.targets file with with your OAuth token (see auth.targets.example)
 
 3. Build the release and include the version (e.g. X.Y.Z) and the name of a changelog file (optional).
 
-    msbuild Release.proj /t:Release /p:Version=X.Y.Z /p:ReleaseNotes="ReleaseNoteFile.md"
+```
+> msbuild Release.proj /t:Release /p:Version=X.Y.Z /p:ReleaseNotes="ReleaseNoteFile.md"
+```

doc/release-notes/NEXT.md

@@ -1,5 +0,0 @@
-* Support renamed tfs branches, baseless merge and automatic branch initialisation when encounter merge changeset(#480)
-* Being able to clone a Tfs subbranch with `--with-branches` option (#703)
-* Add `--force` to unshelve command (#636)
-* Add `--batch-size` to let the user specify the number of changesets fetched at the same time (for big history and big changesets) (#639)
-* Being able to clone TFS path "$/" (#662) 

doc/release-notes/v0.21.0.md

@@ -0,0 +1,33 @@
+* #727 Unshelve on current commit if parent commit can not be found
+* #722 Bugfix
+* #717 Bugfix
+* #716 Bugfix
+* #715 Bugfix
+* #674 Better branch management
+* #703 Being able to clone a Tfs subbranch with `--with-branches` option
+* #702 Add unit tests
+* #701 Docfix
+* #696 Docfix
+* #693 Bugfix
+* #683 Bugfix
+* #678 Fix missing merge parent
+* #675 Improve init with renames
+* #671 Bugfix
+* #662 Being able to clone TFS path "$/"
+* #670 Docfix
+* #664 Improve reliability of fetch
+* #667 Bugfix
+* #668 Bugfix
+* #657 Bugfix
+* #639 Add `--batch-size` to let the user specify the number of changesets fetched at the same time (for big history and big changesets)
+* #646 Fix changeset ordering
+* #636 Add `--force` to unshelve command
+* #638, #681, #721 Update libgit2sharp
+* #640 Bugfix
+* #629 Cleanup now that we do not need VS2008 support
+* #626 Fetch by lots
+* #620 Make `rcheckin --quick` the default
+* #625 Perfs get last changeset id
+* #618 Shorten workspace path
+* #623 Add checkout command
+* #480 Support renamed tfs branches, baseless merge and automatic branch initialisation when encounter merge changeset