Add link to changelogs in cabal file

servant-client/servant-client.cabal

@@ -16,6 +16,8 @@ description:
   > getAllBooks :: BaseUrl -> EitherT String IO [Book]
   > postNewBook :: Book -> BaseUrl -> EitherT String IO Book
   > (getAllBooks :<|> postNewBook) = client myApi
+  .
+  <https://github.com/haskell-servant/servant/blob/master/servant-client/CHANGELOG.md CHANGELOG>
 license:             BSD3
 license-file:        LICENSE
 author:              Alp Mestanogullari, Sönke Hahn, Julian K. Arni

servant-docs/servant-docs.cabal

@@ -5,6 +5,8 @@ description:
   Library for generating API docs from a servant API definition.
   .
   Runnable example <https://github.com/haskell-servant/servant-docs/blob/master/example/greet.hs here>.
+  .
+  <https://github.com/haskell-servant/servant/blob/master/servant-docs/CHANGELOG.md CHANGELOG>
 license:             BSD3
 license-file:        LICENSE
 author:              Alp Mestanogullari, Sönke Hahn, Julian K. Arni

servant-jquery/servant-jquery.cabal

@@ -7,6 +7,8 @@ description:
   You can find an example <https://github.com/haskell-servant/servant/blob/master/servant-jquery/examples/counter.hs here>
   which serves the generated javascript to a webpage that allows you to trigger
   webservice calls.
+  .
+  <https://github.com/haskell-servant/servant/blob/master/servant-jquery/CHANGELOG.md CHANGELOG>
 license:             BSD3
 license-file:        LICENSE
 author:              Alp Mestanogullari

servant-server/servant-server.cabal

@@ -10,6 +10,8 @@ description:
   <https://github.com/haskell-servant/servant/blob/master/servant-server/example/greet.hs Here>
   is a runnable example, with comments, that defines a dummy API and implements
   a webserver that serves this API, using this package.
+  .
+  <https://github.com/haskell-servant/servant/blob/master/servant-server/CHANGELOG.md CHANGELOG>
 homepage:            http://haskell-servant.github.io/
 Bug-reports:         http://github.com/haskell-servant/servant/issues
 license:             BSD3

servant/servant.cabal

@@ -8,6 +8,8 @@ description:
   .
   <https://github.com/haskell-servant/servant-server/blob/master/example/greet.hs Here>'s a runnable example, with comments, that defines a dummy API and
   implements a webserver that serves this API, using the <http://hackage.haskell.org/package/servant-server servant-server> package.
+  .
+  <https://github.com/haskell-servant/servant/blob/master/servant/CHANGELOG.md CHANGELOG>
 homepage:            http://haskell-servant.github.io/
 Bug-reports:         http://github.com/haskell-servant/servant/issues
 license:             BSD3