v0.6.3: Fix -stdin being blocked after a restart until Enter is pressed.

Closes #22.

os.Stdin.Read() blocks until a newline `\n` is provided (due to the OS doing
line-by-line buffering https://groups.google.com/g/golang-nuts/c/NvD-pOTASIk).
Therefore, do not tie the lifecycle of a command with os.Stdin.Read(). Instead,
read from os.Stdin continuously in a background goroutine and feed its data
into the stdinPipe of whichever exec.Cmd is currently running.

v0.6.2

fix bug where we were unwatching everything but 256 files, instead of…

v0.6.1: make unwatching when we hit "too many open files" deterministic

Also clarify in the log message that it's the number of directories watched,
not number of files watched. We don't actually know the number of files watched
since we only add directories to the watcher. On kqueue (macOS) that translates
to one file descriptor used per directory and one file decriptor used per file,
while on inotify (Linux) only needs one file descriptor per directory
(https://news.ycombinator.com/item?id=9063910).

v0.6.0

bump dependencies

v0.5.14: executing debug (#19)

useful to indicate what is being executed

v0.5.13

fix tests for commit 551751b

v0.5.12

-verbose: report parallel wgo command number

v0.5.11

fix readme

v0.5.10: properly drain the timer before use

this might have been the source of various race conditions I saw in the past 😩

references:

https://www.reddit.com/r/golang/comments/1inw7nc/anyone_else_seeing_old_unit_tests_that_involve/

https://blogtitle.github.io/go-advanced-concurrency-patterns-part-2-timers/#time-newtimer

v0.5.9: remove t.Parallel() from problematic tests

Why did the test TestWgoCmd_Run/postpone_on fail once in GitHub Actions but run
successfully when the job was re-triggered?? Why???? Remove parallelism from
problematic tests in hopes it never happens again.