[elpa] externals/async updated (2fa4a8bfc4 -> 5e57e7ff25)

[ELPA Syncer]

elpasync pushed a change to branch externals/async.

      from  2fa4a8bfc4 Merge pull request #168 from Fuco1/fix/add-line-buffering
       new  6707395c1a fix: do not kill process buffer if it was already killed
       new  2fa8184141 Merge pull request #171 from 
Fuco1/fix/kill-correct-buffer
       new  088bfff831 fix: make reading of child message packets more robust
       new  9c0bad496b test: add buttercup test suite
       new  9783eb44e4 ci: add github build
       new  5e57e7ff25 Merge pull request #170 from 
Fuco1/fix/robust-message-parsing


Summary of changes:
 .github/workflows/test.yml |  62 ++++++++++++
 .gitignore                 |   1 +
 Eask                       |  20 ++++
 async.el                   | 136 +++++++++++++++++----------
 tests/test-async.el        | 229 +++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 399 insertions(+), 49 deletions(-)
 create mode 100644 .github/workflows/test.yml
 create mode 100644 Eask
 create mode 100644 tests/test-async.el