Try to use an older cabal version.
authorAndrey Mokhov <andrey.mokhov@gmail.com>
Thu, 7 Jan 2016 01:01:32 +0000 (01:01 +0000)
committerAndrey Mokhov <andrey.mokhov@gmail.com>
Thu, 7 Jan 2016 01:01:32 +0000 (01:01 +0000)
commit05b4a6e3c481e08317678edf8e5aa21e7f658271
treeed1c1e1839f94301c93a0efe9d40dc525b2c523b
parent351c39f38b709a6304e8085cae52fe90d23a2cd9
Try to use an older cabal version.

See #110. [skip ci]
.appveyor.yml