Support servant2-2.5

Author: neurogoo

servant-swagger.cabal

@@ -85,7 +85,7 @@ library
                      , lens                      >=4.17     && <4.19
                      , servant                   >=0.15     && <0.17
                      , singleton-bool            >=0.1.4    && <0.2
-                     , swagger2                  >=2.3.0.1  && <2.5
+                     , swagger2                  >=2.3.0.1  && <2.6
                      , text                      >=1.2.3.0  && <1.3
                      , unordered-containers      >=0.2.9.0  && <0.3