0.1.3

[TSCUtility] Use a separate array property wrapper for PolymorphicCod…

0.1.2: [TSCUtility] Introduce PolymorphicCodable property wrapper (#67)

* [TSCUtility] Introduce PolymorphicCodable property wrapper

This allows encoding and decoding polymorphic types without writing
a bunch of boilerplate code.

* [TSCUtility] Conditionally conform Array to PolymorphicCodable

0.1.1: [TSCBasic] Don't delete empty tmpdir

Only delete tmpdir when explicitly asked by clients.

0.0.1: Merge pull request #8 from apple/update

Sync with SwiftPM trunk