2.13.0

Show-Groups command - http://fsprojects.github.io/Paket/paket-show-groups.html
BUGFIX: Fixed combine operation for framework restrictions - #1137
BUGFIX: Lockfile-Parser did not to parse framework restrictions and therefore paket install could lead to wrong lock file - #1135
USABILITY: Non-SemVer InformationalVersion are now allowed for paket pack - #1134
USABILITY: Dependencies file parser should detects comma between install settings - #1129
COSMETICS: Don't show the pin notice if dependency is transitive
COSMETICS: Don't allow negative numbers in SemVer