Update to 1.9.3

CHANGES:
1.9.3
    #73, fix multithreading and exceptions
1.9.2
    #68, add --no-summary
1.9.1
    #65, add flip (>>=) ==> (=<<) and the reverse
    #61, add --json flag
1.9
    Remove not (isControl x) ==> isPrint (not true for '\173')
    #57, warn on invalid pragmas
    Make the API pass and require comments
    #59, make sure qualified operators match properly
    Rename notTypeSafe annotation to noTypeCheck
    Remove an invalid rule suggesting tanh
    #13, add a --quickcheck flag to test the hints
    Add --typecheck flag to test mode to type check the hints
    Remove incorrect for intercalate to unlines
    #37, remove incorrect hint for isAlphaNum
    #45, add mapMaybe id ==> catMaybes
    #42, add some repeat hints