Allow ouroboros-network-0.8.0.0 (#118)

A revision was already published in
[CHaP](https://github.com/input-output-hk/cardano-haskell-packages/pull/300).

ouroboros-consensus-diffusion/ouroboros-consensus-diffusion.cabal

@@ -112,7 +112,7 @@ library
     , io-classes                   ^>=1.1
     , mtl                          ^>=2.2
     , ouroboros-consensus          ^>=0.7
-    , ouroboros-network            ^>=0.7
+    , ouroboros-network            >=0.7    && <0.8  || ^>=0.8
     , ouroboros-network-api        ^>=0.5
     , ouroboros-network-framework  ^>=0.6
     , ouroboros-network-protocols  ^>=0.5