Downgrade version to 4.5.0

We'll just move the tag ref instead

Merge pull request #211 from getsolus/fix-error-handling-again

Raise `pisi.Error` rather than `Exception` when we want the user to see it

Merge pull request #206 from getsolus/fix-upgrades-typo

Bump version to 4.4.0

Merge pull request #191 from getsolus/434-version-string

Merge pull request #176 from getsolus/version-string-433

Merge pull request #172 from getsolus/version-string

Merge pull request #170 from getsolus/solbuild-jeepening

Merge pull request #169 from getsolus/sheepman4267-patch-1

Update version string