silver-searcher: update to 0.21.0
liferea: maintenance update
fix evaluation since 34301c8
Add zotero 4.0.19 (close #2043)

@vcunat simplied the expression a little.
haskell-keter: update to version 1.2.1
haskell-attempt: update to version 0.4.0.1
haskell-authenticate: update to version 1.3.2.7
haskell-conduit-combinators: update to version 0.2.3.1
haskell-cryptohash: update to version 0.11.4
haskell-failure: update to version 0.2.0.2
haskell-hakyll: update to version 4.5.0.0
haskell-html-conduit: update to version 1.1.0.3
haskell-http-client: update to version 0.2.2.4
haskell-http-reverse-proxy: update to version 0.3.1.2
haskell-language-c-quote: update to version 0.7.7
haskell-linear: update to version 1.10
haskell-profunctors: update to version 4.0.3
haskell-project-template: update to version 0.1.4
haskell-recaptcha: update to version 0.1.0.2
haskell-smtps-gmail: update to version 1.1.0