Cabal revisions of potoki-core-1.5

Hackage metadata revisions edit the .cabal file after upload; each diff below is one revision.

   potoki-core version:   1.5+x-revision: 1 synopsis:   Low-level components of "potoki" description:     stm >=2.4 && <3,     --      profunctors >=5.2 && <6,-    base >=4.7 && <5+    base >=4.9 && <5  test-suite tests   type: