Fix example.cabal

Author: maksbotan

example/example.cabal

@@ -1,7 +1,7 @@
 name:                example
 version:             1.0
 synopsis:            servant-openapi3 demonstration
-description:         servant-openapi3 demonstration
+description:         An example of how servant-openapi3 can be used.
 license:             BSD3
 license-file:        LICENSE
 author:              David Johnson, Nickolay Kudasov
@@ -54,6 +54,7 @@ test-suite swagger-server-spec
   other-modules:
     TodoSpec
     Paths_example
+  build-tool-depends: hspec-discover:hspec-discover >=2.6.0 && <2.8
   build-depends:    base  == 4.*
                   , base-compat >= 0.6.0
                   , aeson >=0.11.2.0
@@ -64,4 +65,3 @@ test-suite swagger-server-spec
                   , QuickCheck
                   , quickcheck-instances
   default-language: Haskell2010
-