support pointers using default tag (#49)

This fixes #47 where `default`, and other set tags, were not setting
pointer types.

Handle ptr smart ptrs (#44)

- Added new default & set types for `chan`, `map`, `slice`, `time.Time`
and `Pointer` types.
- Updated to handle pointer to a `Slice` or `Map` for situations where
code is not under your control. Fixes #43

CI updates

add set modifier (#41)

fix current tracking for unadressable data (#40)

Update README.md

Updated Set logic + added Interceptors (#34)

V4 release (#31)

Remove debug (#23)

Updates (#8)

* add default modifier tag
* fix linting issues
* add unhappy path tests