Fix attoparsec test dependency
Fix attoparsec test dependency

Closes #53

jaspervdj/websockets,zodiac/websockets,nsluss/websockets,jaspervdj/websockets,zodiac/websockets,jaspervdj/websockets,nsluss/websockets,stormont/websockets,stormont/websockets,jaspervdj/websockets,nsluss/websockets,stormont/websockets,zodiac/websockets,jaspervdj/websockets