Fix: restore package postscript

Was erroneously removed due to a bug introduced in Monticello-ct.715.

src/FileSystem-Git.package/monticello.meta/postscript.st

@@ -0,0 +1,23 @@
+(PackageInfo named: 'FileSystem-Git') postscript: '"code to be run after the loading of this package"
+"initialize GitTreeEntry mode inst var"
+modes := Smalltalk globals at: #TEMP_GitTreeEntryModes.
+modes keysAndValuesDo: [:entry :modes |
+	entry convertToCurrentVersion: modes refStream: nil].
+"clean up"
+Smalltalk globals removeKey: #TEMP_GitTreeEntryModes.
+
+"2020-03-10: turn objectCache from Dictionary into GitObjectCache. Just invalidate the cache."
+GitRepository allInstancesDo: [:each | each flushCaches].
+GitPackedRefStore allInstancesDo:
+	[:each | 
+	(each instVarNamed: ''baseDir'') ifNil:
+		[each instVarNamed: ''baseDir'' put:
+			((each repository isKindOf: GitUnitOfWork)
+				ifTrue: [each repository repository]
+				ifFalse: [each repository]) baseDir]].
+GitUnitOfWork allInstancesDo:
+	[:each |
+		each
+			flushCaches;
+			convertToCurrentVersion: Dictionary new refStream: nil].
+'!