v0.9.0

This release continues support for Go 1.19 and the upcoming Go 1.20.

Noteworthy changes include:

• Randomize the magic number header in pclntab - #622
• Further reduce binary sizes with -tiny by 4% - #633
• Reduce the size overhead of all builds by 2% - #629
• Reduce the binary size overhead of -literals by 20% - #637
• Support assembly references to the current package name - #619
• Support package paths with periods in assembly - #621

Note that the first two changes are done by patching and rebuilding Go's linker.
While this adds complexity, it enables more link time obfuscation.

Thanks to @pagran and @lu4p for their contributions!