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README: Fix typo

Refactor

Filter: preserve previous error if func succeeds

Report ExecForEach command exit errors to the pipe

short-circuit on error (fixes bitfield#141)

Tweaks

Merge pull request bitfield#139 from bitfield/http

Add HTTP support via Do, Get, Post

Change some t.Errors to t.Fatals

Don't close pipe in SetError (bitfield#120)

Fixes bitfield#117.

* The pipe shouldn't be closed on SetError function

* Fix TestExecRunsGoWithNoArgsAndGetsUsageMessagePlusErrorExitStatus2 test. It was not checking that exit status is two

* Update test name to match what is really doing

* Fix example for getting exit status from exec

* Add new example for exit status not zero on Exec