0.20.0-alpha008

Paket.exe acuires a lock for all write processes - #469
New command to add credentials - #458
Inherit selective depencies and store the result in paket.lock - #462
Don't add NuGet packages twice to a references file - #460
Fallback to config auth if environment variables are empty - #459
Remove parsing of invalid child element of ProjectReference - #453
Better handling for multiple files from same repository - #451
>= 0 version range simplified to empty string - #449
Extend Public API for plugin
Allow to extract PackageId
BUGFIX: Use Max strategy for paket outdated --ingore-constraints - #463
BUGFIX: Don't delete downloaded github zip file
BUGFIX: Don't touch framework assemblies if not needed
BUGFIX: Check versions file synchronously
BUGFIX: Restore console color after handling exception - #467