New features in this release:
- add
${/} as a companion to ${:} (#90; thanks to @mvdan)
- add
Env.Setenv and Env.Getenv (#96; thanks to @twpayne)
- support stdout/stderr args in stdin (#94; thanks to @mvdan)
- expose current subtest in Env (#95; thanks to @frankban)
Also apply fix to lockedfile to fix #91 (thanks to @myitcv)
