Flush after outputting "ActorScript 0.1 interpreter"

[ggreif]

Funny stream output:

[nix-shell:~/actorscript/src]$ ./asc ../test/fail/bad-unops.as -i
bad-unops.as:1.9-1.11: type error, operator is not defined for operand type
  Nat
bad-unops.as:2.9-2.12: type error, operator is not defined for operand type
  Int
bad-unops.as:6.28-6.30: type error, operator cannot consume expected type
  Nat
bad-unops.as:6.9-6.55: warning, the cases in this switch do not cover all possible values
bad-unops.as:10.29-10.31: type error, operator cannot consume expected type
  Int
bad-unops.as:10.9-10.56: warning, the cases in this switch do not cover all possible values
bad-unops.as:16.1-16.53: warning, the cases in this switch do not cover all possible values
ActorScript 0.1 interpreter

Note that the last line should appear on top of all...

[rossberg]

For flushing, just put %! at the end of the printf format string.

[ggreif]

Fixed by #477. Thanks!