Fix .cabal file

This fixes 'cabal check' warnings.

hsfm.cabal

@@ -30,7 +30,7 @@ library
                        HSFM.Utils.MyPrelude
 
   build-depends:
-                       base >= 4.7,
+                       base >= 4.7 && < 5,
                        bytestring,
                        data-default,
                        filepath >= 1.3.0.0,
@@ -48,10 +48,7 @@ library
                        FlexibleInstances
                        ViewPatterns
   ghc-options:
-    -O2
-    -threaded
     -Wall
-    "-with-rtsopts=-N"
 
 executable hsfm-gtk
   main-is:             HSFM/GUI/Gtk.hs
@@ -70,7 +67,7 @@ executable hsfm-gtk
 
   build-depends:
                        Cabal >= 1.22.0.0,
-                       base >= 4.7,
+                       base >= 4.7 && < 5,
                        bytestring,
                        data-default,
                        filepath >= 1.3.0.0,
@@ -97,8 +94,9 @@ executable hsfm-gtk
                        FlexibleInstances
                        ViewPatterns
   ghc-options:
-    -O2
-    -threaded
     -Wall
-    "-with-rtsopts=-N"
+
+source-repository head
+  type:     git
+  location: https://github.com/hasufell/hsfm