Update to latest LTS and ShellCheck-0.7.0 (wfleming#65)

* Update to latest LTS and ShellCheck-0.7.0

* Fix for removed env values

If we have an existing value in the old env, but it's not in the updated
env, this line would fail. It's been replaced by a no-op. Since we only
write new-env, those will be removed by the process.

* Update env.yml

* Fixup! Update

* Address -Wall errors

Author: pbrisbin

app/CLI.hs

@@ -1,6 +1,5 @@
 module CLI where
 
-import Data.Monoid
 import Options.Applicative
 
 --------------------------------------------------------------------------------

codeclimate-shellcheck.cabal

@@ -39,7 +39,7 @@ library
     , filepath
     , Glob
     , pureMD5
-    , ShellCheck
+    , ShellCheck == 0.7.0
     , text
     , yaml
   hs-source-dirs: src