Log Message:
janet: Update to 1.14.2

## 1.14.2 - 2021-01-23
- Allow `JANET_PROFILE` env variable to load a profile before loading the repl.
- Update `tracev` macro to allow `def` and `var` inside to work as expected.
- Use `(dyn :peg-grammar)` for passing a default grammar to `peg/compile` \ 
instead of loading
  `default-peg-grammar` directly from the root environment.
- Add `ev/thread` for combining threading with the event loop.
- Add `ev/do-thread` to make `ev/thread` easier to use.
- Automatically set supervisor channel in `net/accept-loop` and `net/server` \ 
correctly.