relax the version constraints

[BrunoChevalier]

Hi, your cabal config file contains these:
constraints: base ==4.8.2.0,
ghc-prim ==0.4.0.0,
integer-gmp ==1.0.0.0,
rts ==1.0

I have a newer version of base (4.9.0.0), so fsh failed to build and install.
When I relaxed the constraints to the following, everything worked fine:
constraints: base >=4.8.2.0,
ghc-prim >=0.4.0.0,
integer-gmp >=1.0.0.0,
rts >=1.0

[iostreamer-X]

I see, thanks for bringing it up!
Want to submit a PR?

[BrunoChevalier]

Yeah, sorry for taking so long to answer.
I'll issue a pull request.
See #10